Heated Body. A creature that touches the cerberus or hits it with a melee attack within 5 feet of it takes 5 (1d10) fire damage. 

Hold Breath. The cerberus can hold its breath for up to 1 hour. 

Keen Senses. The cerberus has advantage on Wisdom (Perception) checks. 

Multiple Heads. The cerberus has three heads, while it has more than one head the cerberus has advantage on saving throws against being blinded, charmed, deafened, frightened, stunned, and incapacitated. 

Reactive Heads. For each head past the first one, the cerberus gains an additional Reaction which can only be used for oppotunity attacks.

Shadowmeld. The cerberus creates darkness in a 10 ft. radius.

Wakeful. While the cerberus sleeps, at least one head remains alert.

Innate Spellcasting. The shadowfire cerberus is a 5th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 13, +5 to hit). The shadowfire cerberus has the following warlock spells prepared:

Cantrips: control flames, create bonfire, [Tooltip Not Found]

1st level (4 slots): burning hands, hellish rebuke, hex

2nd level (2 slots): darkness, ray of enfeeblement, scorching ray

3rd level (2 slots): dispel magic, fear, fireball

Multiattack. The cerberus has a number of attacks equal to its number of heads. 

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 12 (2d8+3) piercing damage.