Originally Posted by
professore
Arcane was reliant on 80% dmg from arcane blast, so yea, arcane blast spam, with fillers in the way of frost bolt and arcane missiles to get out of casting mp5 regen. You would chain mana potions and mana gems (3 ranks down from highest, rest were not worth cast time/mana back). It was working only with 2pc bonus of tier 5 set. Frostbolt was very very mana efficient, arcane missiles was good only with clearcasts otherwise mana efficiency was abysmal.
Mainly you would have to control your mana after the first set of cooldown usage, without higher ilvl gear and intellect gems you would consume your manabar in less than 15seconds the Arcane Power duration was. So it was quite challenging to keep Arcane Blast spam for 5minutes or more.