NPCs composing that spawngroup :

an_enthralled_bulthar (33%)

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

sirens_9, range=122 (-571,-113,-112)

sirens_10, range=84 (-551,-25,-92)

sirens_11, range=74 (-523,7,-110)

sirens_12, range=42 (-511,-52,-114)

sirens_14, range=168 (-301,-53,-88)

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

sirens_20, range=195 (-301,54,-88)

sirens_21, range=133 (-457,88,-114)

sirens_22, range=127 (-408,67,-88)

sirens_40, range=199 (-513,150,-151)

sirens_43, range=77 (-492,-119,-115)

sirens_48, range=182 (-404,-216,-57)

sirens_58, range=191 (-522,-229,-52)

sirens_60, range=156 (-500,-198,-52)

sirens_64, range=81 (-531,-98,-91)

sirens_65, range=125 (-498,-167,-90)

sirens_68, range=198 (-331,-187,-169)

sirens_78, range=174 (-577,-182,-114)

sirens_93, range=193 (-353,110,-19)

a_coldspine_sea_hors_190196, range=190 (-374,-210,-169)