Large Monstrosity, Unaligned
AC 20    Initiative −2 (8)
HP 105 (10d10 + 50)
Speed 10 ft.
Mod Save
STR 20 +5 +5
DEX 6 −2 −2
CON 20 +5 +5
Mod Save
INT 6 −2 −2
WIS 6 −2 −2
CHA 4 −3 −3
Resistances Acid, Cold, Fire, Lightning, Poison
Immunities Prone
Senses Blindsight 60 ft.; Passive Perception 8
Languages None
CR 3 (XP 700; PB +2)
Traits

False Appearance. While the snail remains motionless, it is indistinguishable from a wall.

Actions

Goo Spurt. Ranged Weapon Attack: +0 to hit, range 30 ft. Hit: 18 (4d8) Acid damage and the target is grappled (escape DC 15) by slime. While Grappled in this way, the target is also Restrained

Slam. The snail moves up to its Speed. While doing so, it can enter Medium or smaller creature’s spaces. When it enters a creature’s space, that creature must make a DC 15 DEX or STR save (creature’s choice).

On a success, the creature can choose to be pushed back 5 feet or to the side of the snail. On a failure, or if the creature can’t or won’t be pushed, the snail enters the creature’s space and the creature takes 14 (2d8+5) Bludgeoning damage and suffers one effect of the snail’s choice:

  • Pin. The creature is pinned between the snail and a Medium or larger object or creature. Until the snail moves, the creature is Grappled (escape DC 15). While Grappled in this way, it is also Restrained and automatically fails its save against this action.
  • Shove. The creature falls Prone in the snail’s space.
Bonus Actions

Engulf. The snail moves on top of a Large or smaller Prone creature in its space, engulfing it. While engulfed, the creature can’t breathe, is Blinded and Restrained, moves with the snail, and takes 10 (3d6) Acid damage at the start of each of the snail’s turns.

As an action, the engulfed creature can make a DC 15 STR (Athletics) check to free itself. On a success, it escapes to an unoccupied space within 5 feet. The snail can engulf two creatures at a time.

Description

The boxsnail is a perfect example of evolution; adapted to its dungeon environment over long centuries, the boxsnail resembles a dungeon wall while still, seamlessly fitting into alcoves or at the back of hallways.

When its prey is close enough, the boxsnail slithers out and boxes them into a corner, slowly squeezing them to mush or knocking them to the ground so it can dissolve them in its acidic slime.

Boxsnail Lore
► DC 11 HISTORY OR NATURE. The boxsnail is slow and bulky, but incredibly durable; it is resistant to Acid, Cold, Fire, Lightning, and Poison damage. It can shoot goo to pin down fleeing prey and kills its victims by sliding over them and dissolving them.
► DC 13 HISTORY. Acid harvested from the boxsnail’s remains can be used to make three vials of Acid (1 hour, DC 11 Sleight of Hand using Alchemist’s Supplies).

Habitat: Underdark

milmot

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