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Shambling Mound

Large plant, unaligned

Armor Class 15 (natural armor)

Hit Points 136 (16d10+48)

Speed 20 ft., swim 20 ft.

STR
18
+4
DEX
8
-1
CON
16
+3
INT
5
-3
WIS
10
+0
CHA
5
-3

Skills Stealth +2

Damage Resistances cold, fire

Damage Immunities lightning

Condition Immunities Blinded, Blinded, Exhaustion

Senses blindsight 60 ft. (blind beyond this radius), passive perception 10

Languages —

Challenge 5 (1,800 XP)

Proficiency Bonus +3

Lightning Absorption. Whenever the shambling mound is subjected to lightning damage, it takes no damage and regains a number of hit points equal to the lightning damage dealt.

Actions

Multiattack. The shambling mound makes two slam attacks. If both attacks hit a Medium or smaller target, the target is grappled (escape DC 14), and the shambling mound uses its Engulf on it.

Slam. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage.

Engulf. The shambling mound engulfs a Medium or smaller creature grappled by it. The engulfed target is blinded, restrained, and unable to breathe, and it must succeed on a DC 14 Constitution saving throw at the start of each of the mound's turns or take 13 (2d8 + 4) bludgeoning damage. If the mound moves, the engulfed target moves with it. The mound can have only one creature engulfed at a time.

Source: System Reference Document 5.1 (CC-BY-4.0).