Lesser Lunarchidna

Light Sensitivity. While in bright light, the lunarchidna has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Shadow Stealth. While in dim light or darkness, the lunarchidna can take the Hide action as a bonus action.

Spider Climb. The lunarchidna can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Multiattack. The lunarchidna makes one bite attack and two claw attacks.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) necrotic damage. The target must succeed on a DC 12 Constitution saving throw or its hp maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hp maximum to 0.

Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) slashing damage.