Chantico

Illumination. Chantico sheds bright light in a 20 foot radius and dim light in a 40 foot radius

Magic Weapons. Chantico's weapon attacks are magical.

Water Susceptibility. For every 5 feet Chantico moves in 1 foot or more of water, it takes 2 (1d4) cold damage.

Spellcasting. Chantico is a 7-level spellcaster. Its spellcasting ability is Constitution (spell save DC15 , +7 to hit with spell attacks). Chantico has the following spells prepared:
Cantrips (at will): Firebolt, Control flames, Fire Blast, Fire Daggers, Fire Dash
1st level (4 slots): Burning Hands, Faerie Fire, Hellish Rebuke 

2nd level (3 slots): Aganazzar's scorcher, Scorching ray, Flaming Sphere, Eldritch Fire

3rd level (3 slots): Melf's Minute Meteors, Fireball, Fire Step

4th level (1 slot): Conjure Minor Elementals

Multiattack. Chantico makes three claw attack.

Claws Melee Weapon Attack: +6 to hit, reach 5 ft.,  Hit: 6 (1d6 + 3) slashing damage. 

Fiery Strikes (Recharge 4-6). Chantico uses Multiattack. Each attack that hits deals an extra 4 (1d8) fire damage.