Lifeblood Core

Description
"Contains a living core that bleeds precious lifeblood.""When resting, the bearer will gain a coating of lifeblood that protects from a large amount of damage."The player receives 4 Lifeblood HP which is replenished when resting at a bench. This HP cannot be healed with SOUL.

How to Acquire
Left wall of The Abyss is a cave that only opens if you have 15 or more Lifeblood.

There is also an Arcane Egg in the room with it, that becomes permanently unobtainable once you've picked up the charm.