Grinexx (5e Creature)

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Huge dragon, neutral evil

Armor Class 23 (natural armor)
Hit Points 217 (15d12 + 120)
Speed 40 ft., swim 40 ft.

23 (+6) 10 (+0) 26 (+8) 4 (-3) 10 (+0) 7 (-2)

Proficiency Bonus +4
Damage Vulnerabilities cold
Damage Resistances bludgeoning, piercing, slashing
Damage Immunities fire
Senses darkvision 120 ft., passive Perception 10
Languages Lizal
Challenge 12 (8,400 XP)

Hold Breath. The grinexx can hold its breath for 20 minutes.

Magma Swim. The grinexx can traverse molten rock as if it was water.

Weak Point. An attack which specifically targets the grinexx's head ignores its damage resistance. Any attack roll made as a called shot, such as against this weak point, is normally made with disadvantage.


Multiattack. The grinexx makes two melee attacks.

Bite. Melee Weapon Attack: +10 to hit, reach 20 ft., one target. Hit: 28 (4d10 + 6) piercing damage.

Spin. Melee Weapon Attack: +10 to hit, reach 5 ft., all objects and creatures in reach. Hit: 13 (2d6 + 6) bludgeoning damage.

Explosive Heat (Recharge 5-6). The grinexx blasts either super-heated gas or molten rock out of its shell. All creatures within 20 feet of it must make on a DC 20 Strength saving throw. On a failed save, a creature takes 17 (5d6) thunder damage and 17 (5d6) fire damage, and is pushed 10 feet away from it. On a successful save, the creature takes half this damage and isn't pushed. Any creature directly above the grinexx has disadvantage on this saving throw.


Deflect. The grinexx adds 4 to its AC against one ranged attack that would hit it. To do so, the grinexx must see the attacker.


The physical form of a grinexx is reminiscent of a gigantic snapping turtle comprised entirely out of jagged, rough-cut stone. Much like a snapping turtle, a grinexx will fiercely snap its jaws at anything which draws too close to it; unlike its counterpart, however, a grinexx is capable of crushing boulders in its jaws. Its neck is capable of long-reaching, spring-like lunges that can take a bite out of a victim dozens of feet away.

Volcanic Habitat. Although a grinexx can be found in mountains, caverns, and even oceans, the species is most plentiful in areas of abundant molten rock—such as active volcanoes, or the magma-filled oceans of Subrosia. Although they do not directly feed on heat, their cold-blooded bodies thrive best in its abundance.

See also[edit]

  • Trinexx, a more powerful grinexx with three heads, which wields dominion over cold as well as heat
  • Gleerok, a similar turtle-like dragon that swims through magma
  • Dragon Turtle
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