NPCs composing that spawngroup :

an_icy_servant (50%)

a_servant_swordfish (50%)

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

sirens_83, range=71 (-749,-112,-177)

sirens_86, range=1 (-821,-109,-177)

sirens_87, range=90 (-748,-162,-179)

sirens_93, range=62 (-799,-167,-153)

an_enthralled_bulthar (80%)

sirens_117, range=60 (-832,-167,-153)

a_coldspine_sea_hors_190190, range=90 (-889,-166,-175)

a_coldspine_seahorse (50%)
a_swordfish (50%)

a_coldspine_sea_hors_190191, range=65 (-849,-167,-168)

a_coldspine_seahorse (100%)

an_icy_servant_190204, range=82 (-888,-155,-172)

a_swordfish (100%)

sirens_an_enthralled_bulthar6_takp_import_v0, range=59 (-830,-167,-153)

an_enthralled_bulthar (100%)

sirens_223833_takp_import_v0, range=90 (-747,-161,-179)

sirens_223838_takp_import_v0, range=72 (-748,-111,-178)

an_enthralled_molkor (50%)
a_watery_servant (50%)

sirens_223852_takp_import_v0, range=82 (-888,-155,-172)

sirens_223841_takp_import_v0, range=65 (-849,-167,-178)

an_enthralled_molkor (50%)
a_neriad_mistress (50%)

sirens_223836_takp_import_v0, range=90 (-889,-166,-179)