A Soul is an entity one can obtain by slaying any mobs with any scythe power attack (used via right-click) or SoulSteal-enchanted weapons from the Harken Scythe mod. One can then collect them with empty or soul-filled Essence Keeper or Essence Vessel.
Farming souls is easier than farming bloods as a soul, being an entity, does not require a solid block to land on.
The easiest way to farm Souls is via a monster-grinder (especially a Soul Cage grinder).
Any area with Monster Spawners
- Bosses drop copper-colored Souls that fill a Keeper or Vessel to full capacity instantly. It is most efficient to collect these souls with empty vessels.
- Harbingers drop green souls. These souls are worth ten regular souls.
- Spectral Miner spawns as a soul. Upon attempting to collect the soul, the miner will reveal itself and attack the player.