From Another Eden Wiki
Gariyu can only be fought by bringing him the Flame Eater Ash. You will have to pursue the Flame Eater all the way to Xeno Domain and defeat its level 80 form to unlock the fight. Defeating him adds him to the roster.
|??||Quest Mob||Zol Plains||
|1||Burning Shield||Wind RES Up M + Physical RES Up M (3 turns)|
|2||Flame Strike||Fire-type magic attack on all enemies|
|3||I'm gonna burn you up!||All enemies Fire RES Down (3 turns)|
|4||Fiendish Flame||Fire-type magic attack on one enemy + poison|
|5||Explosion||Fire-type magic attack x2 on one enemy|