Through too many hits to the head or just a general lack of motivation to be awake, you've become very good at going to sleep. You gain the following benefits:
Ability Score Increase. Increase your Constitution score by 1, to a maximum of 20.
Undisturbed: You don't need to restart a short or long rest when you are only interrupted once and can finish it by resting for the remaining unspent duration.
Well-Rested: When you finish a long rest, you regain all your spent hit dice and reduce your Exhaustion by an additional level. Further, you have the Advantage on Constitution and Wisdom saving throws for the next hour after finishing the rest.
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