This glitch can allow you to cast 2 of the spells (Inferno [Sorc] and Arctic Blast [Druid] only) without depleting mana for a period of time. When you use the skill, start the ''click-n-hold'' inside the mana meter ball. Your mana will drain as normal, however, when it reaches low numbers it will stop draining, but you will still continue to cast. This glitch seems to randomly not work, although it works more often then not.