NPCs composing that spawngroup :

a_siren_enticer (50%)

a_siren_seductress (50%)

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

sirens_2, range=1 (-365,-407,-174)

sirens_3, range=54 (-404,-369,-176)

a_coldspine_seahorse (50%)
a_neriad_maiden (50%)

sirens_63, range=55 (-402,-447,-116)

sirens_118, range=75 (-406,-469,-117)

an_enthralled_bulthar (50%)
an_enthralled_bulthar (50%)

sirens_223847_takp_import_v0, range=74 (-405,-468,-117)

sirens_a_servant_swordfish9_takp_import_v0, range=54 (-403,-368,-176)

a_servant_swordfish (100%)