The stygian guards from the Rinwell come way too soon. The last game I just played had them killing a civ on turn 9, another on 30, and then 1 of them came for me and wiped me out on turn 34. Perhaps some sort of delay on the spawns? A leash maybe? They are str 7 monsters that gun for cities from the start. Maybe start with Drown and after some # of turns have the Rinwell spawn Stygs?