The Mourner is a boss from the Defiled Lands.
It can be summoned by right clicking a Conjuring Altar with an Idol of Sorrow. The Altar is destroyed after it is summoned.
Conjuring Altar
Drops:
- Remorseful Essence
- 4-16 Defilement Powder
- 8-16 Umbrium Ingot
- 4-8 Scarlite
- 8-16 Heart Crystal Shard