NPCs composing that spawngroup :

Ailing_Walrus (5%)

a_massive_walrus (17%)

a_servant_manatee (16%)

a_servant_sea_elephant (17%)

a_servant_walrus (17%)

a_walrus_servant (16%)

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

sirens_16, range=82 (-227,18,-108)

sirens_51, range=67 (-293,121,-121)

sirens_62, range=95 (-342,140,-19)

an_enthralled_bulthar (50%)
an_enthralled_molkor (50%)

sirens_81, range=73 (-238,91,3)

sirens_93, range=76 (-353,110,-19)

#Ulth_the_Enraged (20%)
an_enthralled_bulthar (80%)

sirens_231253, range=1 (-300,54,-88)

a_servant_sea_elephant (100%)

sirens_231263, range=51 (-352,54,-23)

sirens_231264, range=94 (-341,140,-19)

an_enthralled_bulthar (15%)
a_servant_sea_elephant (85%)

sirens_231269, range=83 (-226,18,-108)

sirens_231280, range=73 (-237,91,3)

an_enthralled_ulthork (10%)
a_servant_sea_elephant (90%)