Magery
Training magery can damage your armor, to train cast spells on yourself. Also equip a 100% Lower Reagent Cost suit to save reagents. Other important properties include up to 40% Lower Mana Cost, having 2 Faster Casting, having 6 Faster Cast Recovery, and as much Mana Regeneration as you can. Finally, equip a Mage Weapon -29 Magery skill Wand with the Spell Channeling property. It will allow you to cast lower skill spells which are faster and consume less mana. You would need an extra faster casting to compensate for the -1 of the Spell Channeling property.
Training:
0-30: - Buy from NPC Mage
30-45: - Cast Fireball
45-55: - Cast Lightning (or Mana Drain for also raise Resisting Spells and Evaluating Intelligence)
55-65: - Cast Paralyze
65-75: - Cast Reveal
75-90: - Cast Flamestrike (or Mana Vampire for also raise Resisting Spells and Evaluating Intelligence)
90-120: - Cast Earthquake