NPCs composing that spawngroup :

an_enthralled_bulthar (33%)

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

sirens_1, range=80 (83,-60,-146)

sirens_19, range=72 (46,-47,5)

sirens_23, range=84 (47,-60,5)

sirens_25, range=13 (77,33,3)

sirens_27, range=66 (102,-40,-135)

sirens_36, range=60 (34,-26,-135)

sirens_37, range=50 (24,11,-135)

sirens_44, range=87 (100,104,2)

sirens_45, range=79 (148,-8,3)

sirens_47, range=54 (19,20,-20)

sirens_73, range=64 (65,-44,-148)

sirens_109, range=83 (115,-52,-100)

sirens_110, range=95 (115,-67,-100)

sirens_115, range=94 (136,-52,-64)

sirens_119, range=95 (102,-71,-135)

sirens_123, range=27 (100,28,-54)

sirens_124, range=69 (143,18,-54)

sirens_125, range=30 (44,27,-54)

sirens_127, range=33 (45,36,-80)

sirens_128, range=81 (4,62,-135)

sirens_112963, range=86 (29,-54,-135)

sirens_231252, range=81 (71,-61,-152)

sirens_231256, range=93 (-19,8,-13)

sirens_231263, range=62 (75,-42,-150)

sirens_231264, range=83 (47,-59,5)

sirens_231277, range=60 (34,-25,-135)

sirens_231278, range=81 (4,62,-135)