Hydrocane

Hydrocane is a staff noted for having a passive Underwater Breathing effect, making it a handy utility item for staff-using classes.

Source
Hydrocane drops from the Viscous Fallout in Gnomeregan.

In the RPG
Staves of this sort are crafted from hydrobarks—small trees that grow along the banks of rivers throughout Azeroth. The rounded remnants of the tree's roots remain affixed to the bottom of the staff, so that the weapon can be set upon the ground and remain standing. The staff's tip is carved into a ring shape, within which floats a bubble of water seeming unaffected by gravity. On one hydrocane of note the tip of the staff is a frozen shard of ice, and the staff appears to be covered in a silvery metal, with the end of the staff inlaid with a blue crystal.