Multiple essence possessed monsters. Click the Crumbling Stone to unfreeze them and start the fight.
The Remnant of CorruptionRemnant of CorruptionStack Size: 9Corrupts the Essences trapping a monster, modifying them unpredictably
Right click this item then left click a monster trapped by Essences to corrupt them. Corrupted Essences cannot be modified again. can still be used on essence-frozen monster, which the Remnant can still unfreeze the monster, without the player clicking the Crumbling Stone. However, the Remnant can also adding one more essence to the monster, making it more difficult to kill.
After clearing all the monsters, clicking Crumbling Stone (the name would changed to Glyphic Fossilised Remains) again will drop Glyphic FossilGlyphic FossilStack Size: 10Has a Corrupt Essence modifierPlace in a Resonator to influence item crafting.. This must be done within the same instance.
The essence possessed monsters themselves drop essences.