Cane of Isis.

Cane of Isis

Power: 80
Type: Staff
Speed: Above Average (0.45)
Requires: Level 60, Mage, Necromancer, ~mancers, Timeweaver, Summoner, Druid
+15 Intelligence, +180 MP, +22 Spell Power, +9 Dark affinity, +9 Light Affinity, +12 Fire Affinity, +12 Water Affinity, +12 Earth Affinity, +12 Wind Affinity, +28% MP costs, +11% reduced casting time

This is one of the best staves of the game for casters, and mages in particular.