Uncontrolled Temper

you have a temper, and as a reaction after getting hit you gain the following:

• You focus on the target that hit you, and you have an advantage on attacks roll against that target and a disadvantage against any other creature.
• You gain resistance against bludgeoning, piercing, and slashing damage.
• You can cast cantrips, if you want to cast a spell you need to succeed on saving throw (Dm choose the save and difficulty) .
• You have a disadvantage on range attacks.
• The effect ends when you kill the target, or after 5 turns,  when not attacking or not taking damage.

You can use this feat number of times equal to half your proficiency modifier (rounded up).