Amphibious. The Rock Leech can breathe in air and water.

Salt Susceptibility. The Rock Leech dehydrates with salt, making each handful of salt thrown at it deal 3 (1d6) acid damage.

Mimicry. Whilst motionless, a Rock Leech is indistingushable from a rock or boulder.

Actions

Bite. Melee Weapon Attack. +4 to hit, reach 5 ft., one target. Hit: 5 (1d6+2) piercing damage. This attack triggers an automatic grapple check to attach itself to the target. If succesful, each consecutive turn deals 3 points of piercing damage as it sucks the blood out of the grappled creature.