Slimy Organs

Starting at 4th level, by sheer force of will, you can, as an action, liquefy organs into slimy vacuoles to gain resistance to bludgeoning, piercing, and slashing damage from non-magical attacks for 1 minute. You can’t use this ability again until you finish a long rest.  Also, while your organs are slimy, if you suffer a critical hit or are reduced to 0 hit points, all creatures within 5 feet of you take acid damage equal to your number of Hit Dice.