Many underestimate the power that frost can wield. the creeping chill can bypass many armors, and frost is devastating against the denizens of the nether. Frost damage also applies a brief slowing effect when it hits.
Fire Damage is a spell from Ars Magica 2. It will inflict 6.5 hearts of damage to the target, unless it is a mob naturally found in The Nether or has Fire Resistance. It will ignore armor.
Fire Damage is found in the Occulus's Offense tab, and requires a blue Skill Point to be unlocked.