[quote=@jasonwolf]
[@The Harbinger of Ferocity] sorry forgot the at mention for question above. Simple version do weaknesses counter powers for tier level?
[/quote]

In general, I'm going to say no. In the specific, I'll say it depends. For example, if you can summon a fireball but it always results in a huge headache that incapacitates you for a while, I would say sure.