Hazza'rah's Charm of Destruction

Hazza'rah's Charm of Destruction is a warlock-specific trinket which increases your critical strike chance for a short period of time. It increases the critical strike of your spells by 140, and is extremely useful in PvP. The trinket is a part of the set called Demoniac's Threads.

While the items required to make the trinket can no longer be obtained, players with the reagents can still create it.

Source
To create this trinket you need the Punctured Voodoo Doll (warlock).

This item can be acquired through crafting or another combine-type effect.

In the RPG
"This broach is carved from humanoid bone to look like many small skulls in tight concentric circles."