When the hero reaches the summit of Magmaroo to seek assistance from Greygnarl, he mistakenly believes the hero to be a Gittish warrior come to slay him.
Greygnarl sacrifices himself to stop an attack by Barbarus targeting the village of Upover.
Death? A shadow of a dragon appears after a villager in Upover offers a jar of Drunken Dragon in the ending scene.
One-time hero of the skies who watched over the world from up over Upover. Not too fond of Celestrians for some reason. This lizard lord of light chased the Empire out of Upover three hundred years ago, and they've never forgotten the slight.
As the fiercest Grotto boss outside of Legacy Bosses, Greygnarl is a truly dangerous foe. Combining the power of three actions per turn with highly damaging abilities, Greygnarl is a very difficult boss. Not only does he have access to the extremely powerful Magic Burst, but he can also incapacitate your party members with Raging Roar. Also noteworthy is his ability to temporarily raise his Attack, Defense, and Agility, as well as preventing the party from matching his stat boosts by casting Disruptive Wave. Luckily, unlike members of the ??? Family who have no weapon weaknesses, Greygnarl can be hit for extra damage by swords and the powerful Dragon Slash.
This famed dragon of light did battle with the darkness in ancient times, earning the moniker 'hero of the skies'. These days he likes to take the shape of an old man and while away the hours in happy idleness
Greygnarl appears as a S-rank member of the Dragon family as part of the limited Dragon Quest IX event, appearing on his own banner alongside Axolhotl. He can participate in Stella's Battle Road as a party member.
Blood of the Berserker Stats up Crack Res +25 Stats up Fire Water: Turn 3 action start: Restores MP and greatly raises Breath potency/effects for 3 turns. Fulmination Breath Potency +5% Stats up Zap Res +25 Stats up Dragon Scale: When attacked by enemy: Heals the user's HP. Fulmination Breath Potency +5% Stats up
Perks
Basic perks
Hero of the Heavens: Action start on odd turns until turn 10: Grants all allies Zapforce in a 5x5 area including self for 3 turns (self: 4 turns). Max HP +30 AGL +20
Leader perk
Raises Zap-type breath potency for all allies, including himself, by 20% in a 5x5 square around him.
Awakening perk
Blood of the Berserker: Raises Move by 1 and raises breath potency by 20%.
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Trivia
The war between Greygnarl and Barbarus seems to be originate from a legend about Heilong River (River of Black Dragon); however, the color of evil and good dragons have been switched.
The name "Greygnarl" indicates his color, as well as his age.
If you look carefully at Greygnarl in Dragon Quest Monsters: Joker 2, someone wearing the Dragon Warrior armour is riding him. It is most likely a reference to the Hero of Dragon Quest IX.
it should be noted that before Greygnarl is fought as a grotto boss he mentions something about "Styrmling" being the third dragon (the first two being himself and Barbarus). This could possibly be similar to "Stellestria" where as the conductor had a past life as something different. Interestingly enough though this is never explored further.