Quetzalcoatl is resistant to Non-Elemental, Fire, and Water artes but weak to Earth, so it’s Edna’s time to shine - bring in Zaveid for good measure, since his attacks won’t trigger Quetzalcoatl’s resistances. This bird god has a special ability that makes him immune to stagger when he has over 70% of his health, making him particularly dangerous right from the get-go. Even attacking Quetzalcoatl with Earth won’t stagger him, so prioritize bringing down his HP quickly while avoiding his attacks. Armatizing with Edna at the start of the battle is a great way to bring him under 70% health since martial artes won’t break his seraphic artes, but your hidden artes can still hit through Quetzalcoatl’s hidden artes.
Other than that, Quetzalcoatl is not too different from the other bosses - dodge his hidden artes (or break them once he’s under 70% health), use martial artes when he’s vulnerable, and use seraphic artes to charge from his hidden artes. Quetzalcoatl‘s icy breath hidden arte can easily be avoided by being directly underneath him, but this leaves you vulnerable to his Earth arte; later on in the fight, fighting underneath Quetzalcoatl also puts you in direct line of sight for his hidden artes “Glider Attack” and “Shadow Eye”. “Shadow Eye” is particularly hard to dodge, but at this point he should have less than 70% health, so your best bet is to interrupt it with some hidden artes of your own.
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