NPCs composing that spawngroup :

a_servant_manatee (50%)

a_servant_sea_elephant (50%)

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

sirens_16, range=81 (-227,18,-108)

sirens_20, range=1 (-301,54,-88)

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=72 (-238,91,3)

sirens_93, range=77 (-353,110,-19)

an_enthralled_bulthar (80%)

sirens_a_coldspine_sea_horse14_takp_import_v0, range=82 (-226,18,-108)

a_coldspine_sea_horse (100%)
a_coldspine_sea_horse (100%)

sirens_223842_takp_import_v0, range=95 (-341,140,-19)

sirens_223843_takp_import_v0, range=73 (-237,91,3)

an_enthralled_molkor (50%)
an_enthralled_ulthork (50%)

sirens_an_enthralled_ulthork16_takp_import_v0, range=10 (-291,49,-85)

an_enthralled_ulthork (100%)