Moon

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Being considered as a Mage-class boss, Runai reflects damage from Mage. Make sure not to bring any to the fight.
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Name	Description
 	
 	
 	
 	
 	
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Runai reflects magic damage, making Mages not a viable option for damage. (However, Elise is still usable here) 
His 4th skill misleads us into believing that he deals PATK damage. Turns out he deals MATK damage instead. 
The safest tactic is using 500 range archer to bait damage — the boss focuses its attacks on archers first and with 500 range the archer stays far enough from healers to be the only damaged combatant. 
Equip the bait with HP items. As long as you keep archer alive, everyone else should be safe, which makes Ashes AOE reduction less necessary than in other Boss Fights. 
Nohara is perfect for this as she also decreases Runai's MATK by 60%. But she also pulls the boss closer, so try using Melee units that can dodge (Karan, Yunho, Asmodeo) so that the boss isn't pulled too close. 
However, if you decide to use the bait tactic, you can't use longer ranged Archers. And with Mages out of the picture, that leaves only Adventurers. 
The main chunk of damage will be bleeding damage, so Kino is recommended. 
Mages are NOT a viable option, but Elise is decent here with root damage and some knockback resist support. 
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1 Bait (optional), 0 Mages, 2 (upto 3) Damage Dealers, Upto 5 Healers.
*Damage Dealers
**Aries: 2nd best option for damage. With knockback immune, you no longer need to be afraid of Runai's knockback. She will also cancel out the problem that comes when using Nohara as bait.
**Bronks: Best option for damage. 80% Knockback Resist and slow ASPD means that little knockback he will receive doesn't impact his damage potential that much.
**Juhong : You can't use bait tactic if you use her.
**Elise : Has enemy % HP damage and adventurer-level ASPD. Downside is having slow MSPD compare to other adventurer, meaning she takes longer time to get back to position to deal damage.
**Elpaiton : Great, especially with fantasy buff.
**Vampir: A considerable choice when not using bait tactic. She has higher Bleed Damage reduction buff to all allies compare to Kino. Make a great combination with Juhong and Kino since she also comes from Ernen Mora.
**Other high single target damage like Cayan/Asmodeo/Arley is considerable.
*Bait
**Nohara: The ideal choice, as she reduces MATK of all Mages by 60%. The problem comes from her pulling the boss.
**Aria: Low range archer, but she knocks herself back so may be dangerous.
**Ayowl: Low range archer, but since he's only expert, will die really easily on higher level cube.
**Note: Equip Cursed Robe (Transcendent gear, reduce magic damage taken by 50%) on the bait is really really good.
*Healers
**Elle: Even at Mythic, she's still the strongest healer in term of healing capability. 
**(Jin) Anaris: Increase allies' knockback resist. Shorter traveling time = More damage time. 
**Wedding Dress Lin: Multiple offensive buffs from 1 unit. 
**Kino: Bleed damage reduction. Highest PATK and ASPD buff. 
**Reny/Celenia: Magic damage reduction buff. 
**Alpha: Less initial damage = Less overall Bleed damage. Barrier is very powerful when uses at the right time.