NPCs composing that spawngroup :

an_enthralled_ulthork (33%)

a_neriad_maiden (33%)

a_watery_servant (34%)

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

sirens_13, range=192 (-817,-232,-72)

an_enthralled_bulthar (50%)
an_enthralled_bulthar (50%)

sirens_15, range=185 (-865,-604,-175)

sirens_16, range=92 (-888,-508,-176)

sirens_48, range=123 (-786,-324,-134)

sirens_61, range=185 (-766,-261,-42)

sirens_62, range=196 (-749,-260,-42)

an_enthralled_bulthar (50%)
an_enthralled_molkor (50%)

sirens_78, range=173 (-887,-591,-179)

sirens_83, range=153 (-714,-387,-120)

sirens_89, range=97 (-855,-516,-180)

a_swordfish (50%)
a_swordfish (50%)

sirens_90, range=1 (-865,-420,-181)

sirens_91, range=140 (-871,-279,-178)

sirens_107, range=32 (-874,-388,-154)

an_enthralled_bulthar (50%)
an_enthralled_molkor (50%)

sirens_223847_takp_import_v0, range=197 (-748,-259,-42)

sirens_an_enthralled_bulthar6_takp_import_v0, range=41 (-873,-378,-154)

an_enthralled_bulthar (100%)

sirens_a_coldspine_sea_horse14_takp_import_v0, range=154 (-713,-386,-120)

a_coldspine_sea_horse (100%)

sirens_223839_takp_import_v0, range=184 (-864,-603,-175)

an_enthralled_molkor (50%)
a_servant_swordfish (50%)

sirens_223840_takp_import_v0, range=172 (-886,-590,-180)

sirens_223856_takp_import_v0, range=90 (-887,-507,-176)

sirens_223867_takp_import_v0, range=141 (-870,-278,-178)

sirens_223863_takp_import_v0, range=26 (-890,-421,-179)