Okay. This is kind of me pulling things from everywhere in my mind, since Crystal seems to be more formless and changeable than anything. Of course, he likes it that way. So, rambling ahead, you have been warned. I have a natural tendency to go off on long infodumps, so caveat lector.

Crystal started out on a fairly obscure universe where magic predominated over tech. (This explains his general disdain for technology - his mind always goes to magic instead, due to it being what he grew up with.) He himself had a relatively uncommon gift, crystallomancy - the magic of crystals and manipulation of the same. Crystallomancers in that universe could store their power in crystals, draw natural energy from them, 'program' energized crystals for specific passive or active effects, (Yes, autonomy is included. Any golem-making operation would have needed a skilled crystallomancer to provide the 'brain'.) and focus magic through crystals to much greater effect than just tossing raw magic everywhere. (Loosely drawn from real-world 'crystal healing/crystal energy' ideas. Please note that I in no way endorse these pseudoscientific wastes of belief.) He also had a much rarer gift, the ability to naturally travel between universes. (Also loosely drawn from something else, in this case Magic: the Gathering. No infringement intended.) His natural method of travel essentially phases him out of one place and into another, even through universe boundaries. Of course, it was considerably upgraded after he became Transcendent, but I’ll talk about that later… For now, all you need to know is that his power randomly activated at some time in his life, whisking him away into the greater multiverse. From there, he found a friendly organization of universe travelers like himself, who had amassed a considerable amount of resources through their lives. One resource that had enabled those lives to go on much longer than anything that should’ve been possible was a rare elixir discovered by one of their members that granted agelessness. Crystal himself was granted access to it soon enough, but took a slightly-too-big gulp, rendering him permanently stuck in a state of relative youth. From there, he traveled the universes, amassing a good amount of resources of his own, occasionally checking in with the Wanderers (as they called themselves) and learning a massive amount of magic along the way. After learning about Name magic, he took the pseudonym of Crystal, but eventually forgot his original name and now simply uses the one you all know him by. Crystal’s general magic paradigm was one in which magical ability increased with age, and so he gradually became tremendously powerful, able to cast even the hardest or most magic-demanding spells with little strain, and many times over. Eventually, though, he gained the ability that was to define him in your eyes, and in my mind.

Which was this. Transcendence, first identified by a fanfiction author as an explanation for a character’s fourth wall breaking antics. A strange expression of a race with a strange magic,’Transcendence’ was an expression of fundament magic, the magic of foundations and substructures. Unlike most members of the race, who focused on the earth, plants, and unconsciously augmenting their own bodies, (all three vital fundaments; earth of life, plants of the food chain, and bodies of their own consciousness and magic) transcendents instead turned their magic to examine the fundament of reality itself. The path had five steps, which will be summed over here. For the sake of this explanation, let us call the race with this magic ’the Grounded’. Also, note that their original work was a cartoon. (Greatest apologies to the one I cribbed this idea and explanation from, but I liked your ideas so much I had to swipe them. If you ever find this, please, take it as an earnest compliment.) (Explanation modified from the original to change certain ideas.)

---

Awareness, to Look Outward
There is far more to existence than what anyone can sense.
The first step of the path is recognizing that the path exists. This isn't nearly as simple as it sounds. The Grounded are a sensible lot, their mental health usually as robust as their physical. Every step of the path entails a sacrifice of sanity, and becoming aware of it carries one of the steeper costs in that regard. That cost paid, the neophyte transcendent can accept that the world does not begin and end at what she can perceive. Paradoxically, she then begins to dimly perceive the ultimate fundament of reality.

Flexibility, to Look Inward
Magic allows actions that aren't strictly permitted by the laws of reality.
The second step of the path is to start walking it in earnest. Now that the transcendent can sense the ultimate fundament, he can begin drawing on it to fuel his magic. When he does, he finds himself capable of vastly more than before. Doors open to him that he thought were walls, or empty space. The versatility of his magic skyrockets, and he finds himself abandoning a bit more common sense as a matter of course. After all, sensibly, he shouldn't be able to appear behind mirrors or call up an extra pair of arms, but didn't he do just that?

Realization, to Look Everywhere
There is a limit to how far those laws can bend. Our world exists beyond that limit.
The third step of the path is to reach what seems to be its end. The realization hits like a splash of cold water; this shouldn’t be possible. The strongest mages can't call up cheese wheels ex nihilo or use their bodies as drills. But then the transcendent starts looking around, and she realizes that her actions pale in comparison to her world. Her tattered sensibility starts questioning things that once seemed beneath contemplation. What is the purpose of winter? Why are benches shaped the way they are? Compared to her world, the transcendent is a bastion of logic and reason, and thus she further seeks the clarity of madness.

Extrapolation, to Look Nowhere
The world as a whole is impossible. As a part of that world, so am I.
The fourth step of the path is to look back and consider the journey. It's all well and good for the transcendent to claim greater sanity than his surroundings, but the transcendent is still a Grounded. For all the costs paid to the path, he cannot deny his roots anymore than a tree could. He came from this illogical, unreasonable world. What does that make him?
This more than any other step is a make-or-break moment for transcendents. Many go completely mad from the contradiction. Some go completely sane, or at least as sane as they were before they began, blocking out all the progress they've made as a defense mechanism. But a lucky few can make the next leap. Whether that luck is good or bad is a matter of debate.

Acceptance, to Look Through
I can't exist, yet I do. No rules need apply.
The fifth and final step of the path is to see the destination at last. The question of the world's sanity is dismissed as irrelevant, for the transcendent understands the world for what it truly is. The glimmers and hints regarding the ultimate fundament's identity resolve into perfect, beautiful clarity: its name is Narrative. The world doesn't have to make sense, because it isn't a consistent universe. It's a work of fiction, a tale told by many storytellers, each with his or her own voice, and no two quite agreeing. Gravity is a consensus. Causality is a convenience. The transcendent has transcended logic and law, and is free to embrace her nature as a fictional character.

Most Grounded avoid even learning about transcendence, beyond knowing of its existence and its status as something to be avoided. They like their sanity, and once begun, the journey cannot stop. It can end, whether by abandoning the path, going mad, or reaching acceptance, but transcendence rejects stasis. Every story must reach its conclusion eventually.

---

Crystal encountered this concept, and naturally tried to adapt it to himself. The process went both horribly wrong and horribly right, compressing what should have been a path of five steps and corresponding gradual loss of sanity and increase in awareness into one agonizing step, carrying a commensurately deeper cost in sanity. He went mildly crazy, while gaining a massive increase in power due to cartoon physics and fifth-wall-awareness being in the hands of someone who actually was prepared to use them for combat. (Which was never thought of in the original universe of the Grounded - those who would have used the power selfishly never survived the process.) The essence of his power is that Crystal is remarkably detached from reality - even more so than a ‘normal’ transcendent, due to the abnormal nature of his ascension to that state. This lets his traveling work much better, and grants him other abilities... But we'll get into that in the next spoiler.

Crystal later developed the abilities that had been unlocked by this initiation further, drawing concepts from the Elder Scrolls universe and ascending to an even higher level of fourth/fifth wall awareness and, crucially, manipulation. His abilities are now less described by the concept of 'transcendence' and more by the concept of CHIM, from the Elder Scrolls universe. CHIM is, essentially, the realization that your entire universe, everything you've ever known, is fictional, and managing to keep individuality and existence in spite of that. Only a truly strong mind, or perhaps one already hardened by the awareness of the ultimate fundament of existence, can keep their awareness together and avoid 'zero-summing', the realization that you don't exist causing you to blink out of existence. (Much like the Hitchhiker's Guide to the Galaxy, in which God, having his existence be proven impossible, immediately vanishes in a puff of logic.) For those who keep their existence and manage to avoid this ignoble fate, CHIM unlocks an entire world of potential. The realization that reality is nonexistent then allows the CHIM-wielder to manipulate it like a lucid dream. Reality is mutable, and theirs for the changing. Crystal's particular variation on this allows him to quite literally write reality, his unique fusion of transcendence and CHIM changing reality through manipulation of its underlying fundament, the post editor of the forums that DTG games are hosted upon.
(For more information on the hard-to-explain concept of CHIM, read this webpage: The Metaphysics of Morrowind)

(This change from transcendence to CHIM was partly precipitated by my discovery of CHIM and realization that it describes Crystal much better, and partially by Tazz's co-opting of the word 'Transcendence' to mean ascension to being an elemental.)

So, after gaining his transcendent status, Crystal continued traveling the multiverse, now trying to make sense of the strange new senses he had, as well as his greatly lowered sanity. One day, he performed his usual checkup on the Wanderers, only to find that they were completely and utterly gone. Their base of operations remained completely intact, but any people that had been there were long vanished. He looted their empty base and continued on his way, amassing their resources to add to his own. He slowly developed hammerspace, creating a massive subspace pocket to store his many possessions and items. Eventually, his travels landed him near the DTG2 Trifecta, and he just had to investigate this confluence of universes. He rushed in, landing in Universe C just in time to be swept up in the massive stream of people to Limbo from Psi-Scratch sending everyone to Limbo. From there, one can read the rest of his story.

So, as you may guess, Crystal has a whole host of abilities, natural and learned. Let's start with his natural abilities. As you can guess, Crystal has a natural affinity for magic, built up across approximately ten millennia of life into something closely resembling godlike power. He's most comfortable with his natural crystallomancy, but can fluently swap to any magic paradigm he's learned over his life quickly and easily, due to a certain flexibility of thought from his transcendent status. His natural ability to travel between universes was also augmented by his transcendence, letting him slip through the borders of reality quicker and easier. His transcendence allows massive amounts of fifth wall shenanigans and overall is extremely versatile. As for his learned abilities, he's managed to gain the ability to learn things very quickly as he sees them, (a near-eidetic memory in other words) so he has managed to learn a lot of powers - I quite literally can't enumerate them all.

His transcendent status gives him mastery of fifth wall abilities, as well as (thankfully) limited ability to access cartoon physics. (Seriously, full mastery of cartoon physics leads to near-invulnerability, near-omnipresence, and a bunch of utility uses, limited only by the Rule of Funny.)

His CHIM-based abilities are much more powerful, especially when combined with transcendence's abilities to manipulate the fundament of reality (which, in DTG's case, is the forums and post editor). As mentioned before, Crystal can manipulate reality through writing events into the post editor, which then happen when the post is posted. He can also just harness CHIM's inherent reality-manipulating powers and do things. The only real inherent limitation on his abilities are the players and the GM, those entities which also exist outside the world and have the same vector for their reality-changing events as he. Players can ignore or counter his posts, while the GM, with final arbitration power over everything that happens in games as well as control over the most powerful entities in DTG games, the Godmodders, is the greatest check on Crystal's power. In theory, if all the players and the GM left, and Crystal was the only character controlled by a player left in DTG, he would gain true, unlimited omnipotence.

Crystal also exists in a very strange fashion, spawned by his status as a (former and current) Author Avatar, as well as his fifth wall abilities. He exists in... layers is the best way to describe it. Here, have an example.
Layer 0: Nonfiction. Actual physical reality. Only I, Crystal's writer, exist.
Layer 1: The first 'fantasy' or 'mental' level. I and Crystal both exist, intermingled so completely you can't really separate us. This is the level the 'concept' of Crystal starts at.
Layer 2: The second 'fantasy' or 'mental' level. I and Crystal both exist, and have gained separate status. However, I still control him completely at this level.
Layer 3: The third 'fantasy' or 'mental' level. I and Crystal both exist, warring for supremacy. At this point, I should note that each layer controls the layer below it. By the transitive property, each layer thus controls all layers below it.
Layer 4: Real enough, in a sense. The mediums of interaction with DTG, the post editor, Pesterchum, et cetera.
Layer 5: Fiction. The world the various DTG games take place in. Only Crystal and my other RP characters exist in this level. The lowest level.
All the layers' instances of me and Crystal are connected, one mind serving for all. However, higher levels can choose to only allow some of their thoughts to be accessible to the lower levels. This allows things like 'Crystal in Layer 3 gains temporary control over Layer 4 and writes to Layer 4 that, in Layer 5, an anvil drops on someone he doesn't like' and it WILL happen, without Crystal in Layer 5 appearing to have even a single thing to do with it, and with the instances of me in Layer 2 and above allowing this, and in fact the instance of me in Layer 0 coming up with the whole idea, while the instance of me in Layer 3 is incensed about his temporary loss of control and with Crystal in Layer 2 seeing that he has no control over himself at all and becoming depressed about it, while not allowing lower instances of him to be consciously aware of this depression.

Crystal looks like a young male with black hair, indistinctly-colored eyes, and fair skin. His usual clothing is a set of open purple robes over a purple shirt and blue pants, finished with black gloves and gray shoes. This can change, such as when he uses True Crystallum, but that's his default appearance. For much of DTG2 he used a Minecraft avatar of an old man with whiter hair, closed robes, and purple gloves, while also paradoxically being on the battlefield himself. Let's say he was melded into the avatar and controlling it directly, or something. (Yeah, let’s go with that.) In DTG0, he’s on the battlefield directly, and as such has his true form.

Cipher’s Call, his preferred method of knowledge-gathering. Confers the ability to see almost anything in most any universe, and can view the thoughts of nearly anyone in existence. Confers as well a large amount of mindscape power, and allows the user to enter others’ mindscapes. Can also summon Indigo Flame for various purposes, attacking or otherwise. Appears as either a blue triangular tattoo burned into his forehead, in the approximate position of a third eye, or as an indigo crystalline two-dimensional pyramid. A Level 10 alchemy in its original game.

The Thaumic Beyond, his voidship. (A spaceship that can travel in the Void) Serves as a base and method of travel. Is basically like a TARDIS in that it contains a massive dimensional space within it that serves to increase the space within. (i.e: It’s smaller on the outside.) Made of Guardmetal, an incredibly durable metal, and contains a Pilot’s Hub for piloting, a Thaumic Hub for magic, 5 Large Crystal Movers plus a FTL Crystal Mover for incredible movement, and a Power Room that supplies magic and other things to the ship. Armed with 6 STAR Turrets, which can instantly punch holes in whatever they hit, and a Thaumic Construct in the Thaumic Hub, which can cast incredibly powerful spells for both offense and defense. Also carries a complement of five Full Thaumic Launchers, AI-piloted. Is massively labyrinthine inside, and thus contains a lot of space for Crystal’s magical experiments and various projects. A composite of many alchemies, Levels various. Mainly high levels though.

The Full Thaumic Launcher, his method of travel if he can’t use his voidship. A spacefighter that is also made of Guardmetal, and thus also protects from the Void. Piloted through sitting in a vat of miraculous liquid, more or less cockpit-shaped, that provides life support and also transmits thoughts to the fighter, allowing mental control. Powered by an alchemy that is basically the magical equivalent of a fusion reactor, contains a magical computer that casts spells (which are used for all its offense and defense) and uses a FTL Crystal Mover to fly. Crystal’s personal FTL is also heavily customized and upgraded, having ship-class Runic Shielding Modules, an active-cast defense that can absorb massive amounts of damage and also strongly deflects attacks, and a focusing crystal in the front of the ship to cast stronger spells with. A composite of four Level 10 alchemies and one Level 5.

Deus Ex Machina, one of his preferred weapons. Has power over light and law, and applies both in massive quantities. Often used in combination with the Abolisher, another Level 10 alchemy, which can abolish even universal laws. The ultimate combo between those two is summoning a massive sphere of bedrock, trapping an enemy inside, reinforcing it with Deus Ex Machina’s power, and then using the Abolisher to abolish the strong nuclear force inside the sphere. Everything inside is reduced to a soup of subatomic particles and living things die instantly. A Level 10 alchemy in its original game.

True Crystallum, another of his preferred weapons. An Intelligent Device from the Nanohaverse massively upgraded with alchemies and charges, this device houses the AI Crystallum. Comprised of a pair of gloves, a staff, a sword, and 16 ancillary crystals, (of which 4 can be out at any one time unless boosted) the gloves are the main core and link to the rest. Having the staff, the sword, or the crystals out swaps True Crystallum into differing modes. Can also enter Full Drive, boosting power massively for a limited time. The general theme of True Crystallum is a versatile and supremely powerful magical computer and multitool. Charged for 100 posts in its original game.

The Rod of Phyrexia, the last of his current preferred weapons. Another Device, this time non-intelligent, with the power to summon and control a magical variant of Phyrexian glistening oil that links back to it. This allows for control of anything infected with the oil, including, if sapient, mind and body, and if non-sapient, essentially all its functions. Also has control over blue and black mana from MTG, allowing supremely powerful mental magic, and has the ability to enter others' mindscapes due to being infused with Indigo Flame. Of note is that the link created by entering the mindscape of an oil-infected person allows near-total control of the mindscape. The glistening oil also allows magic to be cast through it, enabling the rod's mental magic to be cast easily on anyone or anything infected with the oil. Runes can also be drawn with the oil, as it is a powerful magical conduit. The Indigo Flame infused into the rod also allows the summoning of blue flame to burn enemies, or black flame which has been infused with the rod's oil, both searing and infecting. The general theme of the rod is infiltration and information-gathering. Charged for 75 posts in its original game.