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ES_aaaa_xx_yy_zzz
aaaa = type (ie, 'cave')
xx = level of encounter (level of PC)
yy = target waypoint (where it spawns)
zzz = change of firing (1-100)
All of the spawns in the Hillmarch caves are level 5 & 6, with a 25% chance of being one level higher (6 & 7, respectively); all of them have an 85% chance of spawning.
I reduced the number of waypoints (yy) v7374. It's all luck of the dice!