Dungeons & Dragons 5e Element 133 Class Feature: Quack: Organic Harvest

You can begin collecting up to 1d4 organs from slain creatures. You may use such organs to improve your surgery, adding +10 to all of your healing rolls in surgery per organ used. This increases to +14 at 6th and +18 at 8th tier. However, your target must pass a Constitution save with DC 10 plus 2 for every organ used to ensure their body doesn't reject the transplant. Failing this instantly drops them to 0 HP with 1 failed death saving throw. Organs weigh 2 pounds each and will spoil within 1 day if not kept cold. You cannot harvest viable organs from constructs, oozes, plants, or undead. Although most non-spoiled organs fetch a pretty penny in black markets. Every 4 organs you sell successfully, your Wealth score increases by one.