This dungeon is surprisingly simple with Revo Bastet. My team wasn't all +297, but it worked fine.
Revo Bastet(Verdandi)/A. Meimei/Verdandi/Revo Ceres/Perseus(Australis)
F1: Bastet, kill.
F2: Stall until Becrux's wood absorb wears off (really easy, neither does much damage, and if you keep killing Mk. II, Becrux will just keep healing the golem), kill.
F3: Can stall a little here. When you're ready, use a skill and kill.
F4: Don't use a skill, just hit him below 50%. Took me two turns, and then he used High-End Booster and I killed him.
F6: Board change, kill.
F7: Board change, kill.
Quite straightforward tbh. Yay~