While wearing the crown, healing through a cleric spell or ability automatically increases by 1d8, and Jonah takes the same amount of damage; that damage cannot be prevented, reduced, or resisted. Once per long rest, cast Healing Word as a reaction when a nearby creature drops to 0 hit points.[1]
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Overview
The Crown of Thorns strengthens Jonah’s clerical healing, but the added healing wounds him in equal measure. Its magic also lets him answer a nearby creature’s fall with Healing Word.[1]