Bitterness is a crafted legendary mojo for the Witch Doctor in Diablo III. It requires character level 31 to be worn. The level 70 crafted equivalent is Spite.
Stats (Level 31)

Bitterness
Legendary Mojo
Properties:
- +(5–7)–(6–8) Damage
- Critical Hit Chance Increased by 3.0–4.0%
- +60–74 Maximum Mana
- +4 Random Magic Properties
You hold your enemy's future in your hand.
Crafting
Bitterness can be crafted using the Plan: Bitterness, 9000 gold, 15 Reusable Parts, 15 Arcane Dust and 12 Veiled Crystals.