Antimagic

Antimagic talent is a special talent tree that can only be accquired when you're playing Maj'Eyal campaign and only if the first time you've entered the world map you don't have any of the following resource: Mana, Positive/Negative/, Vim, Paradox. After that you will have to do a quest to actually gain access to it.

Gaining access to antimagic tree will also opens up several more talent trees that can be trained for, although beware: all magic-based talents that you have will be unusable from that point on, and you will not be able to use any arcane-powered items, including runes. But, you will gain extra bonus from using any equipment that has arcane-disrupting force property.