Azareck's Ultimate Nullification

The caster of this spell manipulates fate and will in their favour to nullify an effect of their choice. 

Upon casting, the caster takes 2d8 force damage that ignores resistance and immunity. This spell can be used to nullify the following effects: Actions, Legendary Actions, Bonus Actions and Legendary Resistances.

This spell also functions as an 6th level Counterspell and you can also use an action to cast this spell as if it were a 6th level Dispel Magic; furthermore it can be used to dispel: curses, diseases and poisons. If used for any of these then the caster does not take the force damage. 

If any of the effects that are nullified consumes anything to do it (Spell Slot, Legendary Action, Ki point etc.), it is used up.