Bloody Stump

(modeled after magic stone and Green-Flame Blade)

The Dude can slam himself into a wall, the floor or other similarly immovable object to discloate his shoulder with a sickening crunch. He can then wrench his left arm out of the socket, spraying blood ooze (a la Kill Bill) and wield the arm as a club. On a hit, the target takes necrotic damage equal to 1d4 + your spellcasting ability modifier. With each successful hit, the bloody stump sprays blood and tissue in a 5 foot radius all hostile creatures within the spray must make a constitution saving throw or become nauseated for 1 round (disadvantage on the next attack)

At the end of combat, the arm can be jammeed back into place where it will knit back to place after 1 minute.