Help with challenge quest

A maxed skilled Mash-Tamamo-Waver can stand for ever and never die.
Tamamo-Vlad-Waver if you want to clear it faster.

Having merlin is an instant win..
Just use kh + waver + merlin. Even in dante challenge quest, i can beat caster using kh

For me, Gilgamesh, mash, and Merlin worked. If you use 3 command seals to refill Gil’s NP while he has Merlin attack buff and his own buff on, he can probably one shot whole waves not counting the lancers (who will probably take two NP). With three NP’s, that should be 7 or 8 down and the rest you can stall and NP some more. Or you can stall and NP from the beginning and you’ll still be able to win

Edit: Or you can pull a mash solo like this guy did
https://m.youtube.com/watch?v=O_vt4gywx98

I finished it using Merlin Jeanne(tamamo) and Raikou(Jalter) and there was no thrill. It was very easy. No.need for command seals.

mash merlin and cu alter is the easiest way to win.

you can always go to the safe option of mash, jeanne and merlin, i beat the challenge in "only" 96 turns and nobody died

I cleared with Merlin + Mash + friend's Raikou. Gil is even better.
Merlin and Mash with 2030.
Mash is very helpful to stack def buffs since heal is less in this CQ. I put Chloe in the back since the sabers are the last ones but she wasn't necessary

A 10/10/10 Merlin+ 10/10/10 mash and a lvl 70 kiyohime with below lvl 6 skills worked for me but you have to time everything perfectly