Just get Creme others one you will get one way or another at some point.
First tactic i already shown in form of image with text
Spam drum then press drum skill the control the timing
Then 59s use cream puff the healer
At 58-57s use both creme and tank fast. For massive damage and able to form a shield no not die from -100% MAX HP skill.
Then just spam
O3o)b that it tbh have fun everyone