Tumor Troll

Family: Troll

Large giant, chaotic evil

Armor Class 13 (natural armor)
Hit Points 125 (10d10 + 70)
Speed 30 ft.

18 (+4) 7 (–2) 24 (+7) 5 (–3) 7 (–2) 5 (–3)

Saving Throws Wis +1
Damage Immunities poison
Condition Immunities poisoned
Senses darkvision 60 ft., passive Perception 8
Languages Giant
Challenge 6 (2,300 XP)
Proficiency Bonus +3


  • Regeneration. The tumor troll regains 10 hp at the start of its turn. If the troll takes acid or fire damage, this trait doesn’t function at the start of the troll’s next turn. The troll dies only if it starts its turn with 0 hp and doesn’t regenerate.
  • Uncontrolled Growth. When the tumor troll regains hp from its Regeneration trait, it gains a random teratoma from the Teratoma Chart. The teratoma and its effects last until the teratoma is removed or replaced by another teratoma. The troll can have only three teratomas at any given time. If it would gain a fourth, the oldest teratoma fades and is replaced with the new teratoma.


  • Multiattack. The tumor troll makes two Bite attacks and two Claw attacks. It can replace one Claw attack with a Fling Limb attack. When it does, the tumor troll doesn’t have disadvantage on this attack roll from being within 5 feet of a creature, though it can have disadvantage from other sources.
  • Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage plus 3 (1d6) poison damage.
  • Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage.
  • Fling Limb. Ranged Weapon Attack: +7 to hit, range 20/60 ft., one target. Hit: 9 (2d4 + 4) bludgeoning damage plus 7 (2d6) poison damage. Remove one teratoma from the tumor troll. The tumor troll can’t use this action if it doesn’t have a teratoma.


Bulging, swollen flesh and vestigial limbs, teeth, and heads emerge from this creature without rhyme or reason. It rears back, screaming at the sky.

A tumor troll is a troll that has developed a horrifying disease. The disease poisons the troll’s blood and disrupts its regeneration, causing it to respond to even shed skin by generating new limbs and flesh. The result is a creature covered in teratomas and trapped in a cycle of endless pain.

Tumor trolls are more aggressive than most trolls, as feeding is one of the few things that lessens their pain.

Reviled by Trolls. To other trolls, a tumor troll represents one of the worst fates imaginable. Most troll tribes will have nothing to do with their misshapen brethren, while others throw them into funeral bonfires or drop them into deep pits, as acts of mercy.

Accidental Creation. Though tumor trolls occur naturally, magical experiments on trolls occasionally result in a tumor troll. If the experimenter survives, they might leash the troll to guard some section of their lair, as the creatures are easier to manage than troll mercenaries.

d6 Teratoma
1 New Senses. A bevy of new ears and noses give the troll advantage on Wisdom (Perception) checks that rely on hearing or smell.
2 Many Feet. The troll can’t be forced prone.
3 Adrenal Overdrive. The troll can’t be frightened, and it doesn’t suffer from exhaustion.
4 Clinging Limbs. When this teratoma is removed with the Fling Limb action, it attaches to the target. While it is attached to the target, the target takes 3 (1d6) poison damage at the start of each of its turns. A creature, including the target, can use its action to detach the teratoma.
5 Echo Chambers. The troll has blindsight out to a range of 60 feet.
6 New Pain Nerves. The troll has disadvantage on any roll that is not an attack roll.
Section 15: Copyright Notice

Tome of Beasts 3 © 2022 Open Design LLC; Authors: Eytan Bernstein, Celeste Conowitch, Benjamin L. Eastman, Robert Fairbanks, Scott Gable, Basheer Ghouse, Richard Green, Jeremy Hochhalter, Jeff Lee, Christopher Lockey, Sarah Madsen, Ben Mcfarland, Jonathan Miley, Kelly Pawlik, Sebastian Rombach, Chelsea Steverson, Brian Suskind, Mike Welham

This is not the complete section 15 entry - see the full license for this page