NPCs composing that spawngroup :

an_enthralled_molkor (50%)

a_neriad_mistress (50%)

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

sirens_an_enthralled_bulthar6, range=19 (-830,-167,-153)

an_enthralled_bulthar (100%)

sirens_223836, range=40 (-889,-166,-179)

sirens_223847, range=51 (-826,-213,-72)

sirens_223848, range=65 (-820,-108,-177)

an_icy_servant (50%)
a_servant_swordfish (50%)

sirens_223852, range=40 (-888,-155,-172)