Pyrotrice - CR 6 (Medium Monstrosity)

Something I came up with this week after running some (doomed) Cockatrice's in the PUG. 

Medium Monstrosity (Neutral)
Armour Class: 15 (Natural Armour)
Hit Points
: 149 (23d8+46)
Speed 20'; Fly 60'
STR 8 (-1) DEX 17 (+3) CON 14 (+2) INT 4 (-3) WIS 10 (+0) CHA 5 (-3)
Saving Throws: Dexterity +6, Charisma +0
Damage Resistances: Fire
Condition Immunities: Petrification, Ongoing fire Damage
Passive Perception: 10
Challenge: 6 (2,300 xp)
Spell Like Abilities: Wisdom is the Pyrotrice's spellcasting attribute. Spell save D.C. 11, Spell Attack +3.

At-Will: Control Flames*, Pyrotechnics*
* Elemental Evil

Combusting Gaze: Whenever a sighted creature starts its turn within 20' of the Pyrotrice, it must make a D.C. 13 Constitution save or suffer 14 (4d6) Fire damage. Pyrotrice's and Pyrolisks are immune to this attack.
Stoning Peck: Melee weapon attack, Reach 5', +6 to hit, one target, Hit: 6 (1d6+3) piercing damage, and target must make a D.C. 13 Constitution save or be paralysed. At the start of their next turn, they must repeat this save. If they are successful, the paralyses ends. If they fail, they are petrified.

Petrified individuals emit constant heat, and any creature that starts their turn adjacent to them suffer 5 (1d10) points of fire damage.

Reflexive Peck: When an enemy misses the Pyrotrice with a melee attack, the monster makes a single Stoning Peck attack against them.

Whether they are the product of a chance natural pairing, or the result of deliberate cross breeding, the Pyrotrice is the offspring of a Cockatrice and a Pyrolisk. They resemble particularly wretched looking pyrolisk's with long, greasy feathers and hardened green scales. Their eyes glow with a dim yellow light, and they move in a tortured, broken manner. However, they are dimly intelligent in their own way, and are capable of seeking stronger monsters with whom to ally. They breed true with either Cockatrice or Pyrolisks, though not with their own kind. Pyrotrice eggs are lain in clutches of 3-8 eggs, and are small, black-shelled things with green yolks. Some Dundiir nobles consider them a great delicacy, and may pay up to 10 gps per egg!

These monsters can be trained (with some difficulty) to act as guards if raised from birth.