I am failing miserably at the battle with Fire Eyes. Just...its going bad. I think it is an issue with how my party is structured. Any tips?

Pet 1: Moon, Water, Health (https://www.sylestia.com/proficiency/?pet_id=4177156)

Pet 2: Eris, Light, Strength (https://www.sylestia.com/proficiency/?pet_id=4556238)

Pet 3: 6vis, Air, Strength (https://www.sylestia.com/proficiency/?pet_id=4556214)

I just looked over your pets briefly, your pets have the wrong relic. For Moon, you should give her Eris's relic. For Eris, you should give him 6vis's relic. For 6vis, 6vis should have Moon's relic. I also think you should change your party a bit, but that's just me, I prefer a tank, healer, attacker set up, but again, that's just me.

Water/light/air is a good setup. The proficiency points are set up correctly as well. The only problem I can see is the equipment - Assassin is a physical set, so it should go on 6vis, your air-physical attacker. However, to maximize 6vis's damage, I'd use Myrmidon equipment as the strength-dex makes a better combo for an attacker. Eris should have 6vis's evoker equipment. As for Moon, she can use the Assassin equipment - I tend to use str/agi equips for my tank.