Serra quests how to beat em

I just used shards and crystals to level her up, use a weaponless tank for the front lines and used Serra behind them and cheese the kills.

I beat them using Minerva's Level 35 Warriors Map. But I guess you can try an ally who can chip (Pain, Savage Blow, Poison Strike) to assist.

Earlier today there was a post about a person that had a really strong Serra and they shared their friend code

I just used that Serra and got 14 kills really easily by sitting her on the defense tiles

4 star, level 40 serra w/ atk seal and dancer.

Drive atk. Dancers. I used Axura and PA!Olivia(since she could also debuff if needed) plus Lute and Res Ploy. Basically the only thing Serra will attack are low res units. Double dance her to help get the kill. If you go thorough the Training Tower you'll likely only get 1 or maybe 2 kills per map if you are lucky.

I used Genny to chip enemies and got Serra to get the last hit (with Axzura and PA Olivia).

I gave Serra Azama's weapon/staff which does 10 damage on foes and put her on a team with two dancers and a healer. The dancers also had buffs.

I used a tank with threaten res, a healer with pain and savage blow and a dancer to get serra to atk more.

Equip her Assault rather than Absorb and attack seal then use Performing Azura if you have her to give her stat boosts and a second dancer. Only go into training tower battle if it's all mages as her resistance will let her take them without much damage. The 4th teammate should be healing or to mop up those Serra can't.