This is a Gift of Damnation you can receive from the Devilish Contractor Boon.
Choose two Skills. Gain Expertise in the chosen skills.
If you roll a 1 or 2 on an Ability Check using one of the chosen skills, you immediately lose half your maximum number of Hit Point Dice, rounded down. You do not regain Hit Point Dice lost this way until you finish two Long Rests.
*To manually add Expertise, by click on the chosen Skills under the Skills menu, then open the "Customize" drop-down menu and select "Expertise" in the "Skill Proficiency Level" dropdown.
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