The Hollowback Scuttler is a reclusive, cave-dwelling freshwater crab endemic to the deep cliffside pools of Lake Orlanda in the Asari Region of the Habitual Belt on VOI 700 D. It is rarely seen by surface dwellers and is considered one of the most mysterious aquatic invertebrates on the planet due to its isolated habitat, unusual biology, and cultural significance in Orlanda Tribe mythology.

Its name derives from the hollow, bowl-shaped indentation on its carapace, which is used for water storage and regulating body temperature during long periods of stillness in submerged cave chambers.

• Size: 30–35 cm across
• Weight: 5–6 kg
• Carapace: Thick, matte-black with a concave dorsal cavity
• Legs: Long, jointed limbs for navigating slick cave walls
• Eyes: Bioluminescent and capable of rotating independently

• Hollow Carapace Reservoir: Used for thermal regulation and storing oxygen-rich water
• Bioluminescent Eyes: Provide vision in pitch-black cave waters
• Cliff Claws: Hooked claws adapted for gripping onto vertical rock surfaces

• Armor Class (AC): 15 (reinforced shell)
• Hit Points (HP): 38
• Speed: 20 ft. (climbing), 30 ft. (swimming)

• Cliff Snap: 1d10 slashing damage, target must succeed DC 13 Strength save or be grappled
• Shell Slam: 1d6 bludgeoning damage + knockback (5 ft) if used from a wall or ceiling perch

• Cave Camouflage: Gains +4 to Stealth while in rocky or dark aquatic terrain
• Echo Perception: Can sense movement within 60 ft. by detecting pressure and vibration
• Oxygen Reserve: Can survive outside water for up to 3 hours by storing aerated water in its hollow shell