1. Splitting Nails. Your fingernails thicken into blackened talons. Your unarmed strikes deal +1d4 slashing damage for 1 minute, but you have disadvantage on sleight of hand checks requiring delicate hand use.
2. Bonehook Hands. Your fingers split and reform into hooked claws. As above, and you cannot wield weapons with the affected hands for 1 minute.
3. Bulging Eyes. Your eyes swell and twitch in their sockets. You gain advantage on Perception checks for 1 minute, but disadvantage on ranged attacks beyond 30 feet.
4. Blooming Eyes. Extra wet, lidless eyes force themselves open along your temples. You have disadvantage on Concentration checks for 1 minute, but advantage on Perception checks.
5. Distended Jaw. Your jaw unhinges painfully. You gain a bite attack dealing 1d6 piercing for 1 minute, but cannot speak clearly.
6. Feeding Maw. Your face splits wider than it should. As above, and the first time you miss an attack on your turn, you must attack the nearest creature within reach if able.
7. Knotted Flesh. Your muscles bunch and harden unevenly. You gain +1 AC until the end of your next turn, but have disadvantage on Dexterity saves.
8. Calcified Plates. Bone plates burst through your skin. You gain resistance to slashing and piercing for 1 minute, but vulnerability to bludgeoning, and your speed is halved.
9. Lashing Tendons. Your limbs jerk with predatory force, granting you an additional attack on the attack roll, but also causing 4d4 damage when used.
10. Hunting Spasm. Your body lunges without permission. On your next turn, you must move toward and attack the nearest creature if able.
11. Weeping Lesions. Your skin blisters and leaks acrid fluid. The first creature that hits you with a melee attack before your next turn takes 1d4 acid damage.
12. Caustic Rupture. Your flesh splits open in several places. You take 1d6 acid damage, and creatures within 5 feet take 1d4 acid damage.
13. Hyperactive Nerves. Your nerves fire in all directions. You gain advantage on initiative and Perception checks for 1 minute, but cannot take reactions.
14. Nerve Storm. Pain drowns thought. You cannot take reactions, and you have disadvantage on Wisdom and Intelligence saves for 1 minute.
15. Predator Scent. Your body exhales a hot, feral musk. You have disadvantage on Stealth checks for 1 minute, but advantage on Survival checks to track by scent.
16. Aura of Meat. The smell of blood and musk rolls off you. You cannot Hide for 1 minute, and creatures within 10 feet must succeed on a Wisdom save or be frightened until the end of their next turn.
17. Hollow Organs. Something inside you twists out of place. You have disadvantage on constitution saving throws and cannot stand up straight.
18. Reversed Anatomy. Your organs shift visibly beneath your skin. You cannot regain hit points for 1 minute, and when you take bludgeoning damage, you take an extra 1d4 damage.
19. Unmasked Horror. Your body settles into a visibly inhuman shape. You cannot conceal your mutations until you finish a short or long rest.
20. Lasting Deformity. Roll or choose a lingering mutation that remains until removed by class feature, treatment, or powerful magic.