Monster Soul

Monster Souls are functional furniture items that can be placed on the top of blocks. They are dropped by enemies.

When placed, Monster Souls provide a buff to players within a 100-tile radius. The buff grants players +75% damage inflicted (+150% in Expert Mode) with all weapons and -50% damage taken from melee attacks (-75% in Expert Mode) against the corresponding enemy.

Multiple Souls of the same type will not grant stacked buffs. Multiple different Soul types in the vicinity will however all take effect, and consolidate into a single buff icon.

An enemy Soul has a 1/1500 chance of dropping from its corresponding enemy.

Bosses don't drop Monster Souls.

If an NPC lands the killing blow on an enemy that would have dropped a Soul, the nearest player receives the Soul.

The effective range of the buffs from Souls is based on the center of your view, not where your character is at. This can be proved by using Binoculars and Sniper Scope.