Transcendent Lunarchida

Light Invisibility. The lunarchidna is invisible while in bright or dim light.

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

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

Web Walker. The lunarchidna ignores movement restrictions caused by webbing.

Spellcasting. The lunarchidna is a 8th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 15, +7 to hit with spell attacks). The lunarchidna has the following wizard spells prepared: Cantrips (at will): minor illusion, mage hand, poison spray, ray of frost 1st level (4 slots): color spray, detect magic, magic missile, shield 2nd level (3 slots): alter self, suggestion, web 3rd level (3 slots): counterspell, fireball, major image 4th level (2 slots): black tentacles, confusion

Multiattack. The lunarchidna makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) necrotic damage. The target must succeed on a DC 13 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: +6 to hit, reach 5 ft., one target. Hit: 8 (2d4 + 3) slashing damage.

Web (Recharge 5-6). Ranged Weapon Attack: +6 to hit, range 30/60 ft., one creature. Hit: The target is restrained by webbing. As an action the restrained target can make a DC 13 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 5; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).

Lunar Beam (Recharge 5-6). The lunarchidna flashes a beam of moonlight in a 30-foot line that is 5 feet wide. Each creature in that line must make a DC 15 Dexterity saving throw, taking 28 (8d6) radiant damage on a failed save, or half as much damage on a successful one.