What Team Composition do I use?

[SeaFour]

Nice work. 13-9 is a tough one. There has been a few threads about it.

I think Hivemind is a common hero used there, because his drones will take rocket fire. I would use Plat Halo with Hivemind if you have her. Hiveminds leach drone will set off her plat lightning.

Here is a link to one of the threads.

Any hints or tricks for level 13-9 hard?

Francoise + mandrake makes it a cakewalk. The key to winning is not enduring the fight (unless you maximize your ideal heroes, you will always lose in an endurance battle), but blitzing Kurtz. Right before the last enemy is killed in wave one, start pumping Francoise’s silver skill. After the dialogue, once the skill is loaded up (level 4), pass it to mandrake and target Kurtz. He should go down in 3-6 shots, depending on your heroes’ strength.