Added 18 minutes later
Okay, let's do this:
Rel stands to the left of C9 and attacks him.
Tyryl stands to the left and below C16 and uses "Flash" on him, M2, M3, and M4.
Reinheld uses "Gleam" to attack C8, C13, C12, C9 (if alive), and C2. The path ends at Relhiras's previous position, in the upper right corner.
If Tyryl killed all the mages, Goran moves to Jert's corpse and takes the last bombs. If the mages are still alive, he continues to hide.
Still, if Ment is right and C16 is buffed by a Warlock, at least Rel won't die instantly.