NPCs composing that spawngroup :

an_icy_servant (50%)

a_watery_servant (50%)

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

sirens_1, range=20 (204,-126,-181)

sirens_26, range=98 (112,-202,3)

an_enthralled_bulthar (100%)

sirens_28, range=90 (104,-175,-135)

sirens_29, range=62 (137,-175,-135)

sirens_30, range=22 (165,-133,-135)

sirens_31, range=81 (222,-64,-135)

sirens_33, range=71 (175,-68,-135)

sirens_57, range=77 (128,-88,-149)

a_neriad_mistress (100%)

sirens_69, range=37 (201,-103,-181)

sirens_71, range=90 (119,-78,-153)

a_neriad_mistress (50%)
a_neriad_mistress (50%)

sirens_80, range=97 (107,-193,3)

sirens_108, range=88 (168,-52,-80)

sirens_111, range=92 (182,-46,3)

sirens_112, range=21 (179,-158,3)

sirens_113, range=32 (164,-161,3)

sirens_114, range=91 (153,-53,-58)

a_siren_myrmidon (50%)
a_siren_myrmidon (50%)

sirens_116, range=90 (170,-49,-54)

#Mistress_of_the_Darkwater (100%)

sirens_118, range=68 (132,-97,3)

sirens_120, range=67 (120,-141,-54)

sirens_121, range=53 (134,-137,-54)

a_siren_beguiler (50%)
a_siren_myrmidon (50%)

sirens_138, range=13 (200,-142,-135)

sirens_141, range=95 (270,-91,-135)