You have absorbed a Fragment of Suffering-- a tangible representation of an emotion felt by the Apotheon.

Benefit. Each time you spend a Hit Die to regain hit points, you regain additional hit points equal to your proficiency bonus.

Drawback. You have disadvantage on death saving throws.

You can use an action to transfer this fragment to another creature by touching the fragment’s intended recipient. When a fragment leaves a creature, that creature loses the benefit and drawback conferred by the fragment.