Upgrading the Flame Sword requires materials that can only be found in Eltnen. Collect the materials and bring them to Regmos.
Step 1. Take the materials you have obtained from GriffonixA leader of Griffons living in the Kuriullu Mountain in Eltnen. Its entire body is covered in Feather of Fire., the Magma SpiritA spirit wandering about the Geroch Caldera. They’re made up of animated magma. If you kill it, you can get a Magma Essence.s, and Burning BarghestA Barghest roaming around the Geroch Caldera. Its two heads and burning tail befits its name. Burning Barghest Tail is used to strengthen weapons.s to RegmosA Daeva of Flame who prefers not to be too hot. He spends time in the Sky Garden.. (You need to collect: Flame Sword)