Overall, Miruru is great. She have CC, physical def debuff and also good DPS (AOE dmg dealer). Considered as sub-dmg dealer. Clause and Frey is good even in the late-game. However, you might wanna replace Cleo for other hero at a certain point. You can try check KGaming youtube video for further explanation.

Carry me senpai , I don't even reach transcendence 1 yet . However, Kasel with his UW is good enough to tank 60ish Black Dragon. Maybe you can consider Aisha to replace Dimael, he is performing under average right now. Btw, did you guys buy the new Veronica's special package?