Take Psychokinesis, it comes from Chaos Magic; you need to upgrade Fire first, then it will appear – it’s a great ability. And definitely take Light Magic, first of all because it’s a specialized magic, and (Acceleration, Punishing Strike) will significantly increase damage and initiative (Stone Skin, Dodge), and the Dwarves become bulletproof :). It’s better to take an offensive ability instead of a defensive one, as the Dwarves already have high defense, but their damage is not very high.