NPCs composing that spawngroup :

an_enthralled_molkor (50%)

a_watery_servant (50%)

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

sirens_an_enthralled_bulthar6, range=99 (-830,-167,-153)

an_enthralled_bulthar (100%)

sirens_an_enthralled_ulthork16, range=58 (-723,-164,-153)

an_enthralled_ulthork (100%)

sirens_223833, range=50 (-747,-161,-179)

sirens_223837, range=83 (-685,-166,-153)

#Ulth_the_Enraged (20%)
an_enthralled_bulthar (80%)

sirens_223843, range=65 (-693,-146,-149)

an_enthralled_molkor (50%)
an_enthralled_ulthork (50%)

sirens_223848, range=72 (-820,-108,-177)

an_icy_servant (50%)
a_servant_swordfish (50%)

sirens_223868, range=50 (-721,-68,-178)