Gallery Wyrm

Layer 1 · Habitat: Dim Galleries

A pale, eyeless serpent as long as a ship, its skin crusted with stone

Description

A pale, eyeless serpent as long as a ship, its skin crusted with plates of stone it never sheds. It tunnels through the soft rock behind the wall, and many of the galleries are its old paths. Delvers feel it before they see it: a tremor in the floor, dust falling from the ceiling. When it surfaces, it brings the tunnel down with it.

Gallery Wyrm

Huge Monstrosity, Unaligned

AC 16 Initiative +1 (11)

HP 136 (13d12 + 52)

Speed 40 ft., Burrow 30 ft., Climb 20 ft.

Ability scores
STR	DEX	CON	INT	WIS	CHA
22 (+6)	12 (+1)	18 (+4)	3 (−4)	12 (+1)	5 (−3)

Resistances Piercing

Senses Darkvision 60 ft., Tremorsense 60 ft., Passive Perception 11

Languages None

CR 7 (XP 2,900; PB +3)

Traits

Tunneler. The wyrm can burrow through solid rock at half its Burrow Speed and leaves a 10-foot-diameter tunnel in its wake.

Actions

Multiattack. The wyrm makes one Bite attack and one Tail Sweep attack.

Bite. Melee Attack Roll: +9, reach 10 ft. Hit: 22 (3d10 + 6) Piercing damage. If the target is Medium or smaller, it has the Grappled condition (escape DC 16).

Tail Sweep. Melee Attack Roll: +9, reach 15 ft. Hit: 15 (2d8 + 6) Bludgeoning damage. The target must succeed on a DC 16 Strength saving throw or be pushed 10 feet and have the Prone condition.

Collapse (Recharge 5–6). The wyrm slams into the gallery walls. Dexterity Saving Throw: DC 15, each creature in a 20-foot-radius Sphere centered on a point within 60 feet. Failure: 22 (4d10) Bludgeoning damage, and the creature has the Restrained condition under rubble (escape DC 15). Success: Half damage only. The area becomes Difficult Terrain.