Quote Originally Posted by Pirate_1360826 View Post
The first boss is easy (beat it at 95M). The second boss (first bonus boss) is a DPS race -- he doesn't hit hard at all, but you'll need some serious damage to beat him. I get him down to 23% health remaining before I run out of turns (using Pompey with 80 sword and 70 spirit, Blood with 70 sword and 60 spirit, and Genghis with 99 sword and spirit). My other heroes have damage not worth mentioning (including Maria to keep Pompey topped off).

The fight itself is easy, but if you don't have damage then you run out of turns. I have yet to pass second boss (110M overall power).
Have you thought of switching out the gear on ghengis and pompey? You can adjust gear and formation for the bonus bosses.