This is a type of feat where a character's existence, energy, presence, or any given factor from them sustains a structure on any given scale. And through their sustenance, their statistics are subsequently tiered to being at the level of power that is relative to the given scale of the...
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Requirement 1: Specify what exactly is being stabilized so that it is made clear what the character's sustainability is doing precisely.
Requirement 2: Prove that the stabilized structure is being directly sustained by the power of the character and not from the character's abilities, life force, existence, magical properties or any unknown connection that is independent of their statistics.
Requirement 3: Prove that the character's stabilization is comparable to the scale of the structure they are stabilizing. Preferably, it should be proven that the character's sustainability is comparable to the destruction of the structure to best show that their power rivals the destructive output of what would destroy the structure in the first place. Please keep in mind that this may vary depending on how the structure's destruction would occur. For example, if a character sustains the existence of a universe that would not be instantly or immediately destroyed when no longer supported, the power of their sustainability would not be comparable to destructive output that completely and immediately destroys a universe, and would not be sufficient enough to be given a 3-A or Low 2-C rating. However, their sustainability could be given either rating if the universe they sustain would be completely destroyed instantly or immediately without support.
Requirement 4: Prove that the power of the character's stabilization consistently scales to their regular statistics, similar to our standards for creation feats.