Ple-Sen
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I suggest the following:
Relza moves to the left of C9 and attacks it.
Tyril moves to the left and below C16 and uses "Flash" on it, M2, M3, and M4.
Rainhild 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 Tyril has killed all the mages, Goran moves to Jert's corpse and takes the last bombs. If the mages are alive, he continues to hide.
Added 2 minutes later
Alternatively, Relza can be sent to attack C16. In this case, Rainhild will only attack C2 with "Gleam" and end the path above Jert's corpse. Well, if the mages are dead.
Relza moves to the left of C9 and attacks it.
Tyril moves to the left and below C16 and uses "Flash" on it, M2, M3, and M4.
Rainhild 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 Tyril has killed all the mages, Goran moves to Jert's corpse and takes the last bombs. If the mages are alive, he continues to hide.
Added 2 minutes later
Alternatively, Relza can be sent to attack C16. In this case, Rainhild will only attack C2 with "Gleam" and end the path above Jert's corpse. Well, if the mages are dead.