User blog comment:Smaster28/Most powerful Magic/@comment-24264679-20170507214334

1. August Mimic/Nullify Magic: Can replicate any magic while nullifying the users magic. Downside though is that it doesn't work against Holder types.

2. Gemini copy magic. Has the ability to flawlessly copy any person. Downside is that it depends on the caster magic.

3. Minerva territory magic. Has the ability to change any landscape within sight into a bomb. Also has the ability to drain energy of mages or trap them in space.

Honestly though all magic can be said to be powerful if in the right mages hands.