Metas

Metas are entities that represent semi-abstract to abstract concepts such as light or joy. Every meta possess a full and absolute control of their concept, and these abstract concepts are stored in shards called Realiments. No matter how vague the Realiment may be, the Meta will possess absolute control over it in all circumstances, and no control in any other aspect.

Realiments
Metas can overlap in category, but there cannot be a duplicate Realiment. A Meta's Realiment is their only weakness, as all other forms of damage will prove ineffective. Metas are Spirits, and thus have no real set form. Not only that, but they have no physical body to speak of, only a Realiment that must be kept nearby. Realiments are extremely hard to destroy given their nature. (For example, the Realiment of water would just be water).

Sustainability
Metas require mana to exist, but they take their mana from whatever their Realiment details rather than naturally obtaining it like other creatures. This allows many Metas to simply hoard their supply for their own survival, as they do not naturally emit any mana unless using magic.

Origins
Meta's were originally created by the Mother as a way of creating chaos in the Universe to attract the Void. Without any explanation for their existence, the chaos caused by their power and fear gave Rene-Artisan exactly what she wanted, quickly leading up to the Gray War.