It would be ridiculous to try and out-do what Sean K. Reynolds has already brilliantly done for D&D 3.5 in The New Argonauts so at the start of every one of these posts I’m going to 1) thank him for making that supplement (thank you Sean!) and 2) tell you to go download it (it’s free–give it 5 stars because damn). This blog series is not intended to be a reproduction of that product, only a conversion update. Go get it.

Post 1: What You Need To Play

Master Page for D&D 5E Ancient Greece/Monster List

Cerberean Hound

Large beast, neutral evil
Armor Class 15 (natural armor)
Hit Points 136 (16d10+48)
Speed 50 ft.

Saving Throws Dex +4, Con +6, Cha +3
Skills Perception +4, Stealth +4
Damage Vulnerabilities fire
Damage Immunities cold
Senses darkvision 120 ft., passive Perception 14
Languages Common
Challenge 5 (1,800 XP)

Keen Smell. The hound has advantage on Wisdom (Perception) checks that rely on smell.
Pack Tactics. The hound has advantage on attack rolls against a creature if at least one of the hound’s allies is within 5 feet of the creature and the ally isn’t incapacitated.

ACTIONS
Multiattack. The hound bites twice.
Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 8 (1d8+4) piercing damage plus 3 (1d6) cold damage. If the target is a creature, it must succeed on a DC 15 Strength saving throw or be knocked prone.
Breath Weapon (Recharge 6). The hound exhales an icy blast in a 30-foot cone. Each creature in that area must make a DC 14 Constitution saving throw, taking 13 (3d8) cold damage on a failed save, or half as much damage on a successful one.
Tail Spray (Recharge 6). The hound whips its tail in 15-foot cone. Each creature in that area must make a DC 14 Constitution saving throw, taking 11 (2d10) poison damage on a failed save, or half as much damage on a successful one.

This monster was created for The New Argonauts; in a campaign where the old mythic creatures are dying out, Cerberus has been slain by some great hero of the past, and now the gates to Hades’ realm are guarded by his two sons. These large hounds breathe cold like the chill of the grave, and though they lack their father’s poisoned snake-tail, their tails secret poison, which they flick at their enemies. Cerberean hounds have black fur with gray-white ends, and their tails are green and slick with their natural poisons.

Cerberean hounds start with their breath weapons, then bite and tail-poison opponents, tripping if possible. As they’re immune to cold, they’re not cautious about catching each other in their breath weapon areas.

An DC 15 Intelligence (History) check reveals that it’s possible Cerberus has monstrous offspring of his own, and they might have powers relating to his snaky tail and the underworld.