NPCs composing that spawngroup :

an_enthralled_bulthar (50%)

NPCs spawning around that spawngroup :
(Max range : 100)

sirens_48, range=97 (-786,-324,-134)

sirens_61, range=58 (-766,-261,-42)

sirens_62, range=73 (-749,-260,-42)

sirens_67, range=20 (-827,-214,-72)

sirens_78, range=61 (-879,-233,-152)

sirens_87, range=98 (-748,-162,-179)

sirens_91, range=71 (-871,-279,-178)

sirens_93, range=68 (-799,-167,-153)

sirens_117, range=66 (-832,-167,-153)

sirens_231262, range=72 (-849,-167,-178)

sirens_231263, range=68 (-799,-167,-153)

sirens_231264, range=99 (-747,-161,-179)

sirens_231274, range=59 (-765,-260,-42)

sirens_231275, range=74 (-748,-259,-42)

sirens_231277, range=70 (-870,-278,-178)