Spells/Mage: Fix Arcane Missiles proc
Spells/Mage: Mages should be able to see everything while on Invisibility
Spells: Dispel effects can always be cast (no longer return error SPELL_FAILED_NOTHING_TO_DISPEL)
Spells/Mage: Improve Polymorph
Spells/Mage: Nether Vortex
Combustion