Doctor (Quack)

They laughed when you removed the internal organs of your patient. You laughed when you put the organs inside of them. Why? Why not? The Quack is the one who chose the medical life, not to 'help people' or 'ensure the longevity of everyone' but instead for science! How far can the organic body go? How fragile are they? How can they be improved? What sorts of creatures can you CREATE? The Quack gains the ability to talk to ducks and other waterfowl. Perhaps other birds, too. Are the translations accurate? No one really can answer that.

Kooky Surgery

At 3rd level, you are experimenting with bodies. Not your body, but bodies nonetheless! You may perform surgery to examine a body, noting recent damage and any diseases or infections in their system. Upon succeeding a Medicine Check with DC 15, you may also heal the creature by 1d6 + Intelligence mod of hit points. At 6th, your healing increases to 2d6 + Intelligence mod. At 14th, it turns to 4d8 + Intelligence mod. At 18th, it turns to 6d10 + Intelligence mod. Surgery takes 1 hour. If this was done during a short rest, the creature still gains the benefits from its hit die.

Organic Harvest

By 9th level, the Quack can begin collecting up to 1d4 organs from slain creatures. You may use such organs to improve your surgery, adding +2 to all of your rolls in surgery per organ used. This increases to 4 at 14th and 8 at 18th. 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 organs from constructs, oozes, plants, or undead.

Live Harvest

By 13th level, you have learned all you need to know about the body; its strong points, its weaknesses... most of all the weaknesses. Your attacks Critical at 19 and 20. You also harvest 1 organ on a critical melee hit, or destroy 1 organ on a critical ranged hit. Harvesting or otherwise destroying 3 organs from a single creature reduces its hit points to 0.

Unfeeling

By 17th level, you have lost all feelings. Also, your nerves may have malfunctioned. Your Constitution is increased to 20. You gain only half the number of hit points retroactively from this ability score increase, but it increases normally for later levels. You also gain proficiency in Constitution saving throws.