NPCs composing that spawngroup :

a_coldspine_seahorse (25%)

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

sirens_10, range=179 (-551,-25,-92)

sirens_11, range=142 (-523,7,-110)

sirens_14, range=136 (-378,168,-19)

sirens_16, range=66 (-555,202,-154)

sirens_17, range=199 (-469,-45,-88)

sirens_19, range=155 (-577,8,-93)

sirens_21, range=83 (-457,88,-114)

sirens_22, range=133 (-408,67,-88)

sirens_24, range=146 (-378,207,-19)

sirens_39, range=48 (-492,194,-155)

sirens_41, range=31 (-544,155,-152)

sirens_62, range=171 (-342,140,-19)

sirens_86, range=94 (-607,147,-203)

sirens_92, range=118 (-624,192,-204)

sirens_93, range=164 (-353,110,-19)

sirens_94, range=198 (-694,67,-168)

sirens_95, range=156 (-667,120,-194)

sirens_96, range=145 (-649,98,-191)