Construct Chemistry (Homebrew)

Most forms of healing do not affect you, granting you no benefit from healing spells that are unable to effect undead or constructs. As an action, you can spend any amount of your Hit Dice to heal yourself. Roll the die, add your Constitution modifier, and regain a number of hit points equal to the total (minimum of 1). As part of this feature, you can expend 5 hit dice, gaining none of the healing effects, to remove 1 level of exhaustion or neutralize one poison.

You can use this feature a number of times equal to your Intelligence modifier (minimum of once). You regain all expended uses when you finish a long rest or can expend a spell slot of first level or higher for each additional use.