Grinch

Your bad mood has achieved an almost legendary status and has become known far and wide. You gain the following benefits:

Grumpy. You are immune to being charmed.

Miser. When a creature within 60 feet of you rolls a 20 on a d20, you can force it reroll the die, and then use the new roll. Once you used this ability, you must finish a short or long rest before you can use it again.

See?! I told you! When you or an allied creature within 60 feet of you rolls a 1 on a d20, you gain temporary hit points equal to twice your proficiency bonus. Any remaining temporary hit points are lost after 1 hour.