Vil'Sigorath's Troll Curse

"Trolls are creatures known for their towering size and for being one of the more grotesque of the Giantkin. Almost Goblinoid in appearance and sanding about 9 feet tall on average, and have the impeccable ability to regrow or reattach their limbs. People have always disregarded this ability, and it's further malformations and mutations that can arise from such a wild ability, almost like a cancer. I hope to harness this ability and stabilize it, to use it in a ritual spell and stabilize and prompt a wound to heal, without holy assistance."
-- Vil'Sigorath the Incorrect, his last diary entry before trying out his experimental spell and being subjugated to a curse.

Vil'Sigorath was a man of many mistakes, eventually becoming Mortis Sigorath, a man who had accidentally mutated into a four-armed hunchback lich. But many necromancers have adopted his spells into cruel experiments, as well as some ignorant pranksters who just wanna see their buddies freak out as they grow an extra limb, or people who will do these things deliberately just to gain, say, an extra pair of limbs and they just don't know about Alter Self or True Polymorph. 
While one is struck with this curse, take 1d8+1 hit points Necrotic Damage each dawn after a failed Constitution Saving Throw. Additionally, one struck with this curse has the ability to regrow limbs and seal any wounds, rolling 1d10 for chance. If the roll is 5-10, you will end up gaining some kind of mutation, such as an extra limb, head, leg, or other variable body part. Roll a d20 to determine what happens and what you regrow. Either that, or the DM can simply decide what happens, especially depending on where the open wound is placed on a creature's body. Unlike a troll, when a limb is severed (when you take more than 15 points of Slashing Damage in one hit) one's limb does not bounce around like it has a mind of it's own. However, a severed head has the capacity to regrow it's body while the old body falls limp.
The spell is cast by taking a piece of cured and dried leather made from Troll skin and douse it in a Potion of Greater Healing before casting the spell, using the leather as a focus. Apply the leather to an open wound as if it were a cloth to inject the curse, and regrow the limb or seal up the open wound. Acid or Fire Damage will prevent the regeneration of a wound or limb.
The spells Lesser Restoration and Greater Restoration, as well as Remove Curse, can cure one struck by this 4th-level ritual spell.
Lesser Restoration can remove the curse, however some effects will still linger, such as any mutations and extra parts. Greater Restoration will remove all foreign entities from your form including all the extra body parts, and Remove Curse removes any and all curses and diseases from your body, especially when done at high levels, and as for this curse it would also mean the removal of any extra parts. Although the chances are slim it is possible to die from this curse.