Chimera spawn (Goagon)

Two-Headed. The Goagon has advantage on Wisdom (Perception) checks and on saving throws against being blinded, charmed, deafened, frightened, stunned, or knocked unconscious.

Fiery Aura. if a creature starts or ends it's turn within 10 ft of the Goagon the creature takes 5 (1d10) fire damage. 

Multiattack. The Goagon makes one bite attack and one gore attack. or one gore attack and one flame breath attack.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 3) piercing damage. As well as taking an extra 5 (2d4) fire damage.

Gore. Melee Weapon Attack: +5 to hit, reach 5ft., one target. Hit: 8 (1d8+3) piercing damage. as well as an extra 5 (2d4) fire damage

Flame breath. [Recharges on a 5 or 6]:  Ranged breath attack: creatures that are within the 10 ft cone of new and scorching fire breath, need to make a DC 13 Dex save or take 3d6 fire damage.  on a successful save any creatures within the area take half damage.