Crystanium

Crystanium is a specific type of 7D material with several unique properties that make it more exciting than normal crystals.

Origins
It's not currently known at all where crystanium comes from. Of course, there are a few theories. One states that it forms through some unknown process in 7D, but it's a completely natural substance. Another says that it actually originates from another megaverse as a method of travel. As far as anyone knows due to the entities that use them, there seems to be no limitation on them. Which is confusing, as that's not very in line with conservation of energy.

Mechanics
The inner workings of crystanium are yet to be fully understood, but it has a few notable properties.

Composition
While this aspect isn't understood very well, there's at least some basic knowledge on the substances that form crystanium due to the pruskite entity's instability. It is at least partly composed of other particles from this reality, such as Thaums and Aether. In addition, there seems to be a curious unidentified particle that is able to form a crystal lattice with all sorts of other ones in a variety of way. Not much is known about its general uses due to the existence of only one example [and one who isn't exactly normal by that], but it's theorized that the appearance of crystals is actually caused by the specific composition of each particle within the crystalline structure.

Relationship With Life
Crystanium is notable for being able to support non aetheric life. Because of this, they are able to function without a soulform. However, crystanium life functions quite differently than that of other life. For one, it's been noted that anything that is their crystanium even if it is not their main body hosts their essence in some form. Some entities like Calamity use this to reconstruct themselves new bodies, while others use them for maintaining connections with other entities. It can also be used for tracking purposes, as they seem to be able to tell where their crystals are to some magnitude.

In lieu of soulforms, crystanium life has been deemed to instead use a structure called a matrix. It seems much less vital as some entities has been noted to come back from total destruction of them. It is more likely, then, that a matrix serves to host some kind of complex instance of their existence where they can experience things to their fullest potential and use their abilities unhindered. This would best explain why they are seemingly immortal, though this might not be true for all entities as its inconsistent with a few of them. It's very likely that like other building blocks of life, crystanium merely holds the potential to do so - a shock, not all beings with carbons have the ability to undo aging.

Despite its capacity to avoid doing so, some varieties of crystanium seem to hold the ability to support soulforms in some method. How well they're capable of doing so is questionable, but the existence of The Librarian shows that it's a possibility. Indeed, it seems that crystanium has a vast capability to fuse and function with vastly different entities, even if its in an imperfect form.