Might Required - 15K+
Boss - 11:30 ST
In-game name - Pauļuška
Sasquatch, Dove Keeper, Walla walla - These are a must use in my opinion.
Gunslinger, Ghoulem -Not my first choice but best you have for now, in the future replace with someone like Anubis and Skeletica.
For the 6th one you can use Esprita or Skull Knight or Grimfiend, Also Trixie treat but she is at low level. I would use Esprita but its your choice.
Also try to change their talents.