Trails in the Sky 3rd : Chapter 2 - Rostrum Boss (Nightmare)

0:42 : The battle begins
Lvl 101/102
Certainly the easiest way to beat him. It's an impressive boss at first, but once you understand its pattern, it's easy to play around. The reinforcement's spawn are pretty much random. I tried to move my characters close to a corner in order to successfully bait the first monster for him to hit Rostrum but to no avail. You don't need to Chaos Brand the bugs (that's their name !), but it helps a lot as they deal of ton of damage. Otherwise, you'd have to precast earthguard, which is a bit troublesome
Let's be serious, Julia IS broken thanks to Mirageberg (2)