[Abilities] stackable Abilities

[Saevon]

E.g. Evasion + Evasion = Improved Evasion

We need to be able to know that of you get Ability A from any source, and you already have it it improves(stacks) instead of becoming useless. Thus if you lose either of those abilities you also lose the improved version

[apravdin]

Are there any abilities such that if you have ability A AND B you get ability C?

[Saevon]

I don't think so,
though it could be Evasion + improved Evasion = Super evasion or something
if it seems easy to do allow our code to work with that as well