Shambling Mound

Large Plant, Unaligned

AC 15    Initiative −1 (9)
HP 110 (13d10 + 39)
Speed 30 ft., Swim 20 ft.

Ability Scores
STR 18 (+4) Save +4    DEX 8 (−1) Save −1    CON 16 (+3) Save +3
INT 5 (−3) Save −3    WIS 10 (+0) Save +0    CHA 5 (−3) Save −3

Skills Stealth +3
Resistances Cold, Fire
Immunities Lightning; Deafened, Exhaustion
Senses Blindsight 60 ft.; Passive Perception 10
Languages None
CR 5 (XP 1,800; PB +3)

Traits

• Lightning Absorption. Whenever the shambling mound takes Lightning damage, it regains Hit Points equal to the damage dealt.

Actions

• Multiattack. The shambling mound makes three Charged Tendril attacks. It can replace one attack with a use of Engulf.
• Charged Tendril. Melee Weapon Attack: +7 to hit, reach 10 ft.
  Hit: 7 (1d6 + 4) bludgeoning damage plus 5 (2d4) lightning damage. If the target is Medium or smaller, it is pulled 5 feet toward the shambling mound.
• Engulf. One Medium or smaller creature within 5 feet must succeed on a DC 15 Strength saving throw or be pulled into the shambling mound’s space. The target is Grappled (escape DC 14), and while Grappled, it is also Blinded and Restrained. It takes 10 (3d6) lightning damage at the start of each of its turns. The engulfed creature moves with the shambling mound. Only one creature can be Grappled this way at a time.