Multiattack. The Crystal Cave Face can make one Chomp attack and one Crystal Eye Beam attack (if available).
Chomp. Melee Weapon Attack: +8 to hit, reach 5 ft., 1 target. Hit: 16 (3d8 + 4) bludgeoning damage.
Crystal Eye Beam (Recharge 5-6): All creatures in a line 20 feet long and 10 feet wide must make a Dexterity saving throw DC 16 or take 20 (5d8) fire/cold/acid/lightning/thunder damage.
Burrow: If attacked, the Cave Face can burrow back into the cave walls for a total of its movement speed.
Description
These monsters disguise themselves as parts of the cave wall and feast on the cave walls they burrow through. They are not hostile unless attacked, which has led to many a miner's death. They have two strong hind legs to move themselves through tunnels and have slimy sides to support this.
This is the Crystal Variant. Depending on their color, they will have a beam attack of a certain element as well as resistance to that same element (They do not have resistance to all elements listed on the resistances, but rather just the one corresponding to their color).
Red: Fire
Blue: Cold
Green: Acid
Yellow: Lightning
Colorless: Thunder
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