This was my first run. Wave 3 was extra scary because I did NOT have enough maximum HP to take a synced carbuncle hit. Good thing I brought Echidna for that peace of mind!
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Strategy:
1. Wave three is, in my opinion, the scariest challenge here. Try to have more than 31,500 HP so you can take a hit from synced Carbuncles. This being the third wave means that you may not have any cooldowns up!
a. Try as much as you can do stall for cooldowns before proceeding to wave 3!
2. Take note that the Keeper on wave 6 will pre-emptively hit for 9573 damage. You cannot avoid taking this damage (unless you pop a damage absorb skill before proceeding to this wave) so make sure to heal up before disposing of wave 5!
3. The Boss will use a pre-emptive status shield. This means that you cannot use delay skills like Echidna on him. Be prepared to tank him if you cannot take him out in just a few hits!
4. The boss dragon hits extremely hard, but on a three turn timer. It is unlikely you will survive a single hit from him if he uses a skill. My team in this video was unable to take a single (skill) hit from the boss.
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Team:
Ares leader, Max level, Max skill
Phoenix Knight Homura, Max level +4, Max skill
Horus, Max level +2, Skill level 2
Chiyome, Level 80
Echidna, Max level +65, Max skill
Freyr friend leader, Level 98 +1, Skill level 5