The Lobotomizer

The Lobotomizer is a one-handed dagger with a damage proc leaving a lowering intellect debuff.

Source
The dagger is sold to players for by their respective Alterac Valley faction by:
 * Gaelden Hammersmith  Alterac Valley
 * Thanthaldis Snowgleam  Alterac Mountains
 * Grunnda Wolfheart  Alterac Valley
 * Jekyll Flandring  Alterac Mountains