Asti First Lock

Vigilant. Asti can't be surprised.

Crystalline Nature. Asti does not require air, food nor water, but needs to consume elemental energy once a day

Spellcasting. Asti is a 9-level spellcaster. Its spellcasting ability is CHA (spell save DC 17, +8 to hit with spell attacks). The Asti has following spells prepared:
Cantrips (at will): Control Flames, Frostbite, Friends, Thorn Whip
1st level (4 slots):Faerie Fire, Sanctuary, Expeditious Retreat, Chaos Bolt
2nd level (3 slots): Continual Flame, Pyrotechnics, Dragon's Breath
3rd level (2 slots): Elemental Weapon, Fireball

Multi-attack. Asti can attack twice when taking the attack action.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 2) slashing damage. 

Spit. RangedWeapon Attack: +7 to hit, range 20/60 ft., one target. Hit: 7 (1d8 + 2) elemental damage limited to fire or a recently absorbed damage type.

Sting. Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: 4 (1d4 + 2) piercing damage, and the target must succeed on a DC 15 Constitution saving throw or become poisoned for 1 hour. If the saving throw fails by 5 or more, the target falls unconcious for the same duration, or until it takes damage or another creature uses an action to shake it awake.

Consume Elements. As a reaction, Asti can absorb half of the elemental damage taken by an ally within 5 feet. Asti regains hit points equal to half of the absorbed damage