NPCs composing that spawngroup :

#Echo_of_Sebilis (5%)

myconid_priest (33%)

sebilite_juggernaut (29%)

sebilite_juggernaut (34%)

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

sebilis_6, range=65 (-1413,150,-194)

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

sebilis_17, range=166 (-1326,-32,-175)

sebilis_28, range=111 (-1289,226,-175)

#Echo_of_Sebilis (5%)
myconid_warrior (95%)

sebilis_31, range=180 (-1209,21,-178)

#Echo_of_Sebilis (5%)
myconid_priest (95%)

sebilis_33, range=141 (-1302,0,-175)

#Echo_of_Sebilis (5%)
myconid_priest (95%)

sebilis_37, range=101 (-1253,159,-175)

#Echo_of_Sebilis (5%)
myconid_priest (95%)

sebilis_39, range=189 (-1211,261,-175)

#Echo_of_Sebilis (5%)
myconid_warrior (95%)

sebilis_110, range=172 (-1189,195,-175)

sebilis_111, range=180 (-1188,212,-175)

sebilis_133, range=49 (-1301,135,-123)

crypt_caretaker (20%)
dar_ghoul_knight (80%)

sebilis_139, range=54 (-1367,185,-104)

Imperial_Crypt_Guardian (100%)
Imperial_Crypt_Guardian (100%)

sebilis_140, range=117 (-1310,243,-103)

sebilis_141, range=170 (-1488,234,-122)

skeletal_champion (100%)

sebilis_142, range=132 (-1424,243,-103)

Harbinger_Freglor (20%)
skeletal_harbinger (80%)

sebilis_143, range=112 (-1311,27,-103)

Hierophant_Prime_Grekal (20%)
skeletal_hierophant (80%)

sebilis_160, range=129 (-1425,27,-103)

Baron_Yosig (20%)
skeletal_baron (80%)

sebilis_183, range=191 (-1159,136,-175)

sebilis_193, range=184 (-1243,283,-112)