Source: Xanathar's Guide to Everything
Prerequisite: Dwarf
You have the blood of dwarf heroes flowing through your veins. You gain the following benefits:
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Increase your Constitution score by 1, to a maximum of 20.
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Whenever you take the Dodge action in combat, you can spend one Hit Die to heal yourself. Roll the die, add your Constitution modifier, and regain a number of hit points equal to the total (minimum of 1).