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“Ferocious, three-headed hellhounds. Their triple-fanged bites are difficult to dodge. ”
—In-game description in The Sacred Stones

The Gwyllgi (ケルベロス Keruberosu, lit. Cerberus in the Japanese version) is an enemy-only Monster class that is exclusive to Fire Emblem: The Sacred Stones. The promoted form of the Mauthe Doog class, these savage, three-headed hellhounds are significantly more dangerous than their unpromoted counterparts, ripping the flesh of their foes with deadly attacks administered by their fangs. Gwyllgi are distinguishable by their three-headed forms, alongside a mane that is murky green in colour.



Gwyllgi often possess high Skill and Speed, as well as decent Strength, making them particularly suited to killing slower, weaker units. Their maximum stats are equal to those of a male Swordmaster, but their bases and growths are superior. Furthermore, they have a Movement range that is equal to that of a Paladin. Most, if not all Gwyllgi, are equipped with Hellfangs, which are the same as Silver Swords.

Due to their high Speed and Skill, like Mauthe Doogs, they're the fastest and most accurate of their respective monster tiers. Unlike their lower-level counterparts, Gwyllgi of a similar level to the player's units tend to have enough health to shrug off a single attack without much issue.

Gwyllgi can be encountered as enemies on Floors 4 and 7 of the Tower of Valni, alongside Floors 1-5 and possibly 7 and 8 of the Lagdou Ruins.


Base Stats


Maximum Stats


Growth Rates



"Gwyllgi" means either "Wild Dog" or "Twilight Dog" in Welsh. "Cerberus", the Japanese name of the class, is derived from the creature of the same name from Greek and Roman mythology.