NPCs composing that spawngroup :

an_enthralled_bulthar (50%)

an_enthralled_molkor (50%)

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

sirens_13, range=73 (-817,-232,-72)

an_enthralled_bulthar (50%)
an_enthralled_bulthar (50%)

sirens_48, range=73 (-786,-324,-134)

sirens_61, range=17 (-766,-261,-42)

sirens_67, range=90 (-827,-214,-72)

an_enthralled_bulthar (50%)
an_enthralled_molkor (50%)

sirens_87, range=98 (-748,-162,-179)

sirens_118, range=98 (-724,-165,-153)

an_enthralled_bulthar (50%)
an_enthralled_bulthar (50%)

sirens_231262, range=46 (-703,-267,-27)

an_enthralled_molkor (100%)

sirens_231264, range=99 (-747,-161,-179)

an_enthralled_bulthar (15%)
a_servant_sea_elephant (85%)

sirens_231274, range=16 (-765,-260,-42)

a_watery_servant (100%)
a_watery_servant (100%)

sirens_231275, range=1 (-748,-259,-42)