Alnaar

Skin of the Molten Caves. A creature that starts its turn within 5ft of the Alnaar must make a DC 16 Constitution saving throw, taking 14(4d6) fire damage on a failed save, and half as much damage on a successful one. A creature that touches the Alnaar or hits it with a melee attack takes 7(2d6) fire damage. Nonmagical weapons and objects with an AC of 15 or lower are immediately destroyed after coming into contact with the Alnaar's skin. Weapons that hit the Alnaar deal their damage before being destroyed. This trait is suppressed if the Alnaar is Starving. 

Starving Wrath. If the Alnaar hasn't fed on a Medium or larger creature within the last 12 hours, it is Starving. While Starving, the Alnaar's AC is reduced by 2, it has advantage on attack rolls against any creature that doesn't have all its hit points, and will direct its attacks at a single foe, regardless of tactical consequences. Once it feeds on a Medium or larger corpse or reduces a Medium or larger creature to 0 hit points, it is no longer Starving. 

Multiattack: The Alnaar makes three Fangs attacks. 

Fangs: Melee weapon attack, +9 to hit, reach 10ft, one target. Hit 14(2d8+5) piercing damage plus 3(1d6) fire damage. 

Flare(Recharge Special): The Alnaar becomes superheated, expelling momentous energy outwards in a 20ft radius blast around it. Each creature in that area must make a DC 17 Dexterity saving throw, taking 22(4d10) fire damage plus 22(4d10) force damage and is knocked Prone on a failed save, and half as much damage and suffer no ill effects on a successful one. The blast ignites flammable objects that aren't being worn or carried. After using this action, the Alnaar is Starving. It can't use this action while Starving. 

On the Hunt: When a creature the Alnaar can see moves, the Alnaar can move up to 20ft toward the moving creature. If the Alnaar moves within 10ft of that creature, it can make one Fangs attack against that creature.