Medium Construct, Lawful Neutral
AC 28 Natural Armor    Initiative +15 (25)
HP 865 (47d20 + 372)
Speed 60 ft., Climb 40 ft.
Mod Save
STR 30 +10 +19
DEX 30 +10 +19
CON 30 +10 +19
Mod Save
INT 30 +10 +10
WIS 30 +10 +10
CHA 30 +10 +10
Resistances Psychic, Radiant
Immunities Acid, Cold, Fire, Necrotic, Poison, Slashing; Blinded, Charmed, Deafened, Exhaustion, Frightened, Petrified, Unconscious
Senses Darkvision 120; Passive Perception 25
Languages Understands all languages. Cannot Speak. To understand the vague pincer movements, a creature must succeed on either a DC 22 perception check, or a DC 22 Insight check.
CR 30 (XP 155,000, or 155,000 in lair; PB +9)
Traits

Reflective. When hit by radiant damage, reflects 1/2 the damage back towards the source.

 

Actions

Move. Moves up to Sixty Feet.

Action Melee Attack. Pincer: +12 to hit, reach 20 ft., 1 target. Hit: # (7d10 + 12) Bludgeoning damage.

Reactions

Toxic Cloud. When hit by Piercing or Bludgeoning damage, it releases a poison gas cloud that deals 3d20 poison damage or half on a successful DC 25 CON save to all creatures within 10 feet of the crystal crab. This cloud remains for 3 turns, and deals its damage at the start of each of the crab's turns.

Legendary Actions

 

Suffocating Cloud (Costs 3 Actions). Attacks all monsters within thirty feet with a poison gas cloud, bringing all non-immune enemy's hit points to zero on a failed DC 28 CON save and gives disadvantage on the first and second death saves. Can only be used once and cannot be used when the Crystal crab has more than 150 HP remaining.

Description

Enter a general description for your monster here.

Lair and Lair Actions

A 120x120 cavern with crystal walls and one Crystal Crab in the center. There are thirteen geysers distributed throughout the cavern.

Lair Actions

On initiative count 25 (losing initiative ties), the Crystal Crab takes a lair action to cause one of the following effects; the Crystal Crab can’t use the same effect two rounds in a row:

  • Eight of the Thirteen geysers erupt, dealing 9d12 acid damage to all creatures in a 10-foot radius from the center of each geyser, half on a successful DC 24 Dex save.
  • Each of the four walls collapse in 10 feet, permanently shrinking each of the cavern's dimensions by twenty feet and dealing 1d20 bludgeoning + 2d20 piercing + 15d6 slashing damage to all creatures caught in the rubble.

 

Ethan123456789_10

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