NPCs composing that spawngroup :

an_enthralled_molkor (50%)

a_servant_swordfish (50%)

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

sirens_3, range=92 (-773,-617,-155)

a_coldspine_seahorse (50%)
a_neriad_maiden (50%)

sirens_15, range=1 (-865,-604,-175)

sirens_16, range=97 (-888,-508,-176)

sirens_78, range=25 (-887,-591,-179)

sirens_89, range=87 (-855,-516,-180)

a_swordfish (50%)
a_swordfish (50%)

sirens_223840_takp_import_v0, range=25 (-886,-590,-180)

sirens_223856_takp_import_v0, range=98 (-887,-507,-176)