Dinosaur, Mbielu

Family: Dinosaurs

Huge beast, unaligned

Armor Class 15 (natural armor)
Hit Points 95 (10d12 + 30)
Speed 30 ft., swim 20 ft.

19 (+4) 14 (+2) 16 (+3) 2 (-4) 12 (+1) 6 (-2)

Skills Perception +3
Senses passive Perception 13
Challenge 3 (700 XP)

Special Traits

  • Toxic Skin. A creature that touches the mbielu or hits it with a melee attack exposes itself to the mbielu’s poisonous skin. The creature must succeed on a DC 13 Constitution saving throw or be poisoned for 1 minute. While poisoned in this way, a creature also suffers disadvantage on Intelligence, Wisdom, and Charisma saving throws.


  • Tail. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 20 (3d10 + 4) bludgeoning damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone.


  • Rollover. If the mbielu is grappled by a Large creature, it rolls on top of the grappler and crushes it. The mbielu automatically escapes from the grapple and the grappler takes 20 (3d10 + 4) bludgeoning damage.


This lumbering saurian quadruped has large, oblong plates of bone covered in greenish slime protruding from its back and its thick, club-like tail.


Large Plates. People describe this reptilian herbivore as “the animal with planks growing out of its back.” The mbielu is a large dinosaur akin to a stegosaurus, with square dorsal plates that support symbiotic colonies of toxic, green algae. The plates themselves are as large as shields.

Aquatic Herbivore. An mbielu spends most of its life underwater, feeding on aquatic plants and avoiding the withering glare of the harsh sun, but it comes onto land frequently to sun itself for a few hours before immersing itself once again.

Toxic Alchemy. Its dorsal plate algae undergo an alchemical reaction in the continual transition between water and sky, especially during mbielu migrations to new watery dens. The algae produce a hallucinogenic contact poison that clouds the minds of most creatures. Mbielus themselves are immune to the toxin.

Section 15: Copyright Notice

Tome of Beasts. Copyright 2016, Open Design; Authors Chris Harris, Dan Dillon, Rodrigo Garcia Carmona, and Wolfgang Baur.