Blizzard (Ability)

From Blizzard's New MMO Wiki

Those familiar with Warcraft II or Warcraft III will recognize the classic mage ability, Blizzard. It deals its damage over 8 one second long ticks, each doing 1/8th the total damage. Like all channeled spells, the mana cost is deducted before channeling starts, so the full cost is paid regardless of how long you get/need to channel before the spell is interrupted or the target is dead. The spell is best used against crowds of targets that are not able to hit you to interrupt your channeling.