My endgame formation was like this:
Here is what I did (followed this guide:
https://www.youtube.com/watch?v=ykU_Eb1ekZE):
- Deploy Katie (AW60) to where Claudia is
- Deploy Iris (AW60)
- Deploy Sybilla (AW50; max skill) and instant skill
- Deploy Nanaly (CC80; max skill) and instant skill
- Deploy Prince (180)
- Deploy Fedora (AW40) or second healer if needed. If not, deploy Waltz (CC50; 7/10 skill) for attack boost.
- Switch Katie out for Claudia (70)
- Right after you deploy Claudia, deploy the two skeleton tokens. When KotD comes, keep summoning them. If you are not fast enough, deploy a lightning rod with high HP and MR. During this, you should also activate Waltz and Nanaly's skill for maximum damage.
- Keep using your units' skills until all mobs are dead.
In your case, this guide fits your team:
https://www.youtube.com/watch?v=rvGTsKaJlHI
Zenobia can replace Jerome. If you have Shuka, she can replace Uzume and if you have Waltz, she should boost Nanaly (right) and Elizabeth (left) enough to kill the KotD before he kills your Gellius. If necessary, you have Lyla and Thetis who should make good lightning rods if your burst units can't kill the king in time. Your AW Fedora should be able to do enough healing in place of Camillia.