Geomancer, for all intents and purposes, already exists in the game.
When you do the Conjurer class quests, they describe how their magic works, and it's basically identical to how geomancer works. But not only this, but in Othard, they have character categorized as geomancers, and they function very similarly to the Gridanian conjurers, even down to the three primary elements they use.
Given that part of the core identity of berserker is that you lose control of the character while they're in berserk mode, this wouldn't be a job that really works with how this game plays too. Warrior has it's inner beast mode, which is as close to berserker as we're probably going to get.
