Animated Coffin

Large Construct, Unaligned

AC: 16

Initiative: +1 (11)

HP: 60 (8d10 + 16)

Speed: 30 ft., climb 30 ft.

STR
16 (+3)
DEX
12 (+1)
CON
15 (+2)
INT
3 (-4)
WIS
11 (+0)
CHA
3 (-4)

Immunities: poison; psychic

Condition Immunities: blinded; charmed; deafened; exhaustion; frightened; paralyzed; petrified; poisoned

Senses: blindsight 60 ft. (can't see beyond this radius), Passive Perception 10

Languages: understands the languages of its creator but can't speak

CR: 3 (XP 700; PB +2)

False Appearance.

If the animated coffin is motionless at the start of combat, it has advantage on its initiative roll. Moreover, if a creature hasn't observed the coffin move or act, that creature must succeed on a DC 18 Intelligence (Investigation) check to discern that the coffin is animate.

Spider Climb.

The animated coffin can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Actions

Multiattack.

The animated coffin makes two Slam attacks.

Slam.

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) bludgeoning damage.

Entrap.

Melee Weapon Attack: +5 to hit, reach 5 ft., one Large or smaller creature. Hit: The target has the grappled condition (escape DC 13). Until this grapple ends, if the target is not an Undead, the target has the restrained condition and takes 14 (4d6) piercing damage at the start of each of its turns. The animated coffin can grapple only one creature at a time.

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Animated Coffin

Source: Adventure Atlas: The Mortuary - Licenses and attribution