NPCs composing that spawngroup :

a_coldspine_seahorse (100%)

NPCs spawning around that spawngroup :
(Max range : 200)

sirens_10, range=147 (-551,-25,-92)

sirens_11, range=104 (-523,7,-110)

sirens_12, range=150 (-511,-52,-114)

sirens_14, range=111 (-378,168,-19)

sirens_16, range=150 (-555,202,-154)

sirens_17, range=133 (-469,-45,-88)

sirens_19, range=178 (-387,-77,-88)

sirens_20, range=158 (-301,54,-88)

sirens_21, range=1 (-457,88,-114)

sirens_22, range=52 (-408,67,-88)

sirens_24, range=142 (-378,207,-19)

sirens_39, range=111 (-492,194,-155)

sirens_40, range=84 (-513,150,-151)

sirens_41, range=110 (-544,155,-152)

sirens_51, range=166 (-293,121,-121)

sirens_62, range=125 (-342,140,-19)

sirens_86, range=162 (-607,147,-203)

sirens_92, range=197 (-624,192,-204)

sirens_93, range=105 (-353,110,-19)

sirens_96, range=193 (-649,98,-191)