Warden Heart

"The heart of a powerful creature, dropped by the Atoned Horror."

The Warden Heart is a item obtained as a drop from Revenant Horror  if you are Zombie Slayer level 7 or higher.

Usage
It can be used to craft the Warden Helmet (highly regarded as the best damaging helmet in the game).

Trivia

 * This is the first item in the game with the, the second being the Shiny Relic.
 * It costs tens of millions of coins in the auction house.