Hymn to Sildor

It has 21 to 24 damage and requires level 10. The most interesting ability of this item is that it reduces the mana cost of all spells to 1. This can be combined with expensive skills, such as Black Hole, Wrath or Parallel dimension, or it can be used to save stat points as a fighter because you can afford your more expensive attack skills without investing into intelligence or mana regen.