Piercer

Medium Aberration, Unaligned

AC: 15

Initiative: +3 (13)

HP: 22 (3d8 + 9)

Speed: 5 ft., climb 15 ft.

STR
13 (+1)
DEX
13 (+1)
CON
16 (+3)
INT
1 (-5)
WIS
7 (-2)
CHA
3 (-4)

Skills: Stealth +5

Senses: Blindsight 30 ft., Darkvision 60 ft., Passive Perception 8

CR: 1/2 (XP 100; PB +2)

Habitat: Underdark

Treasure: Individual

Spider Climb.

The piercer can climb difficult surfaces, including along ceilings, without needing to make an ability check.

Actions

Bite.

Melee Attack Roll: +3, reach 5 ft. Hit: 5 (1d8 + 1) Piercing damage.

Drop.

The piercer falls. Dexterity Saving Throw: DC 11, one creature directly underneath the piercer. Failure: 10 (3d6) Piercing damage. Failure or Success: The piercer reduces any damage it takes from the fall by 20.

Find this creature in the encounter builder

Piercer

Source: Monster Manual (2025), p. 240 - Licenses and attribution