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Tremor-Beast

Large monstrosity, chaotic evil

AC
18
HP
120
Speed
CR
5

A massive, beetle-like horror with a single cluster of shifting, multicolored eyes. Tremor-beasts burrow through solid stone with ease, emerging to feed on anything that moves. The hypnotic patterns swirling in their eyes can confound the mind, sending victims into gibbering confusion.


Armor Class 18 (natural armor)

Hit Points 120


STR
20 (+5)
DEX
10 (+0)
CON
18 (+4)
INT
7 (-2)
WIS
12 (+1)
CHA
8 (-1)

Senses darkvision 60 ft., tremorsense 60 ft., passive Perception 11

Challenge 5


Traits

Tunneler. The tremor-beast can burrow through solid rock at half its burrow speed, leaving a 10-foot-diameter tunnel in its wake.

Shifting Gaze. When a creature starts its turn within 30 feet of the tremor-beast and can see its shifting, hypnotic eye-patterns, it must make a DC 14 Wisdom saving throw. On a failure, the creature is confused for 1 round, and on its turn it must roll a d8 to determine its behavior: 1-2: The creature uses all its movement to move in a random direction. 3-4: The creature does nothing. 5-6: The creature uses its action to make a melee attack against a random creature within reach. 7-8: The creature can act and move normally.

Actions

Multiattack. The tremor-beast makes one Mandibles attack and two Claw attacks.

Mandibles. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 18 (3d8 + 5) piercing damage.

Claws. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.

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Further reading

Jetpack7 Game Master Series
The Game Master's Book of Random Encounters
Jeff Ashworth · 2020
The Game Master's Book of Traps, Puzzles and Dungeons
Jeff Ashworth · 2022
The Game Master's Book of Legendary Dragons
Aaron Hübrich · 2022