NPCs composing that spawngroup :

a_coldspine_seahorse (25%)

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

sirens_9, range=85 (-571,-113,-112)

sirens_10, range=48 (-551,-25,-92)

sirens_11, range=60 (-523,7,-110)

sirens_17, range=42 (-469,-45,-88)

sirens_19, range=126 (-387,-77,-88)

sirens_21, range=150 (-457,88,-114)

sirens_22, range=157 (-408,67,-88)

sirens_42, range=197 (-627,-213,-111)

sirens_43, range=69 (-492,-119,-115)

sirens_48, range=195 (-404,-216,-57)

sirens_52, range=179 (-585,-216,-52)

sirens_53, range=195 (-538,-246,-52)

sirens_58, range=177 (-522,-229,-52)

sirens_59, range=198 (-493,-250,-51)

sirens_60, range=146 (-500,-198,-52)

sirens_64, range=50 (-531,-98,-91)

sirens_65, range=115 (-498,-167,-90)

sirens_78, range=145 (-577,-182,-114)