NPCs composing that spawngroup :

a_watery_servant (100%)

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

sirens_13, range=59 (-817,-232,-72)

an_enthralled_bulthar (50%)
an_enthralled_bulthar (50%)

sirens_48, range=67 (-786,-324,-134)

sirens_61, range=1 (-766,-261,-42)

sirens_62, range=16 (-749,-260,-42)

an_enthralled_bulthar (50%)
an_enthralled_molkor (50%)

sirens_67, range=77 (-827,-214,-72)

an_enthralled_bulthar (50%)
an_enthralled_molkor (50%)

sirens_87, range=99 (-748,-162,-179)

sirens_93, range=99 (-799,-167,-153)

#Ulth_the_Enraged (20%)
an_enthralled_bulthar (80%)

sirens_231262, range=62 (-703,-267,-27)

an_enthralled_molkor (100%)

sirens_231263, range=99 (-799,-167,-153)

sirens_231275, range=17 (-748,-259,-42)