NPCs composing that spawngroup :

an_enthralled_bulthar (33%)

a_coldspine_sea_horse (34%)

a_watery_servant (33%)

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

sirens_15, range=184 (-865,-604,-175)

sirens_16, range=87 (-888,-508,-176)

sirens_48, range=142 (-786,-324,-134)

sirens_78, range=170 (-887,-591,-179)

sirens_83, range=179 (-714,-387,-120)

sirens_89, range=101 (-855,-516,-180)

a_swordfish (50%)
a_swordfish (50%)

sirens_90, range=25 (-865,-420,-181)

sirens_91, range=143 (-871,-279,-178)

sirens_107, range=36 (-874,-388,-154)

an_enthralled_bulthar (50%)
an_enthralled_molkor (50%)

sirens_223847_takp_import_v0, range=199 (-833,-230,-72)

sirens_an_enthralled_bulthar6_takp_import_v0, range=46 (-873,-378,-154)

an_enthralled_bulthar (100%)

sirens_a_coldspine_sea_horse14_takp_import_v0, range=180 (-713,-386,-120)

a_coldspine_sea_horse (100%)

sirens_223839_takp_import_v0, range=183 (-864,-603,-175)

an_enthralled_molkor (50%)
a_servant_swordfish (50%)

sirens_223840_takp_import_v0, range=169 (-886,-590,-180)

sirens_223856_takp_import_v0, range=86 (-887,-507,-176)

sirens_223867_takp_import_v0, range=144 (-870,-278,-178)

sirens_223845_takp_import_v0, range=26 (-864,-419,-182)