Immediately upon arriving in Biroclef Ridge, you’re thrown into a boss battle with a Griffin. Stay clear of its fiery breath, whirlwind, and claw attacks by avoiding standing in front of it—these attacks are unblockable hidden artes, and can be dodged by moving behind the Griffin. You can also interrupt or capitalize on these attacks with your hidden and seraphic artes, which makes armatization particularly useful. Make sure that your active seraphs are Lailah and Edna, and armatize to capitalize on its elemental weaknesses. Between your two armatized forms, you should be able to interrupt any of its powerful attacks with your own. If you’re having trouble staggering the Griffin and find yourself taking too much damage, use Rock Satellite while earth armatized and don’t be afraid to get in close when you need to stop it from spewing flames or a whirlwind. When you're not armatized, play defensively—the Griffin has extremely high Attack and Arte Attack stats, so it won't take many hits to bring you down.
After the battle, head west and cut down the vines blocking your path. Use Wind Rush to leap across the gap, and then head up the ridge on your left. Take a right in the tunnels and follow the path that leads to Gododdin on the western edge of the map.