Celebrating personal victory I fought frost trolls with number of different builds but destro mage right now beated them all. With destruction on 36, 25% perk for fire damage, 70% extra mana regen from gear, 25% mana regen from resto perk, 50 extra magicka from gear he burned like a torch. After numerous disappointments with the mage archetype in Skyrim finally a feeling of satisfaction. Banzai.