Rod of the Sleepwalker

Rod of the Sleepwalker is a staff with very impressive bonuses to intellect and spirit, making it an obvious choice for any magic-using class, though Horde warlock players may prefer the stamina found on a  instead.

Source
This item drops from Twilight Lord Kelris in Blackfathom Deeps. It has a High (51% - 99%) Drop Chance.

RPG
"An egg-sized blue gem glitters atop a length of gnarled and twisted wood. The gem sheds an arcane glow that illuminates the length of the staff.

The origin of the rod of the sleepwalker remains shrouded in mystery, but it belongs to Twilight Lord Kelris of the Twilight’s Hammer."