The fundamentals of Arcane Blast have been changed so that every time one casts Arcane Blast, the damage is increased by 15% (a reduction) and the Eve isk mana cost by 200% (down from 300%). This can be stacked 3 times. Mana cost has been reduced significantly to 9%. Additionally, Arcane Explosion, Counter-spell, Mage Armor, Polymorph, Portal, Slow Fall, Slow, and Teleport have all had their mana cost changed to a percentage of the base mana. Other changes include cool-downs and total duration times.