NPCs composing that spawngroup :

Hierophant_Prime_Grekal (20%)

skeletal_hierophant (80%)

NPCs spawning around that spawngroup :
(Max range : 200)

sebilis_6, range=159 (-1413,150,-194)

sebilis_16, range=65 (-1309,-38,-175)

sebilis_17, range=60 (-1326,-32,-175)

sebilis_18, range=142 (-1193,-53,-175)

sebilis_21, range=173 (-1154,-48,-175)

sebilis_24, range=112 (-1350,133,-176)

sebilis_31, range=102 (-1209,21,-178)

#Echo_of_Sebilis (5%)
myconid_priest (95%)

sebilis_33, range=28 (-1302,0,-175)

#Echo_of_Sebilis (5%)
myconid_priest (95%)

sebilis_37, range=145 (-1253,159,-175)

#Echo_of_Sebilis (5%)
myconid_priest (95%)

sebilis_122, range=145 (-1275,-114,-175)

sebilis_123, range=120 (-1282,-90,-175)

sebilis_133, range=109 (-1301,135,-123)

crypt_caretaker (20%)
dar_ghoul_knight (80%)

sebilis_139, range=167 (-1367,185,-104)

Imperial_Crypt_Guardian (100%)
Imperial_Crypt_Guardian (100%)

sebilis_160, range=114 (-1425,27,-103)

Baron_Yosig (20%)
skeletal_baron (80%)

sebilis_183, range=187 (-1159,136,-175)

sebilis_194, range=185 (-1148,115,-105)