NPCs composing that spawngroup :

#a_shrouded_bat (100%)

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

frozenshadow_42, range=43 (357,36,-1)

frozenshadow_43, range=63 (377,54,-3)

a_shadowbone (50%)
a_shadowbone (50%)

frozenshadow_44, range=37 (287,74,-1)

frozenshadow_45, range=55 (355,87,-1)

frozenshadow_81, range=60 (255,47,-1)

frozenshadow_133, range=1 (313,49,-3)

#Xalgoti (50%)
a_shadow_beast (50%)

frozenshadow_141, range=70 (384,58,304)

an_emerald_familiar (50%)
an_emerald_familiar (50%)

frozenshadow_142, range=47 (336,7,306)

a_frost_familiar (100%)

frozenshadow_143, range=76 (250,7,306)

frozenshadow_149, range=73 (293,-21,306)

a_shadowed_banner (100%)

frozenshadowa_shadow_beast0106568844, range=68 (375,81,-1)

a_shadow_beast (100%)

frozenshadowa_frost_familiar00075517892, range=73 (381,80,306)

a_frost_familiar (100%)

frozenshadowa_frost_familiar00075563818, range=90 (401,23,306)

a_frost_familiar (100%)

frozenshadowa_frost_familiar00275645687, range=78 (369,-9,306)

a_frost_familiar (100%)

frozenshadowa_frost_familiar00375685452, range=82 (385,6,303)

a_frost_familiar (100%)

frozenshadowa_shadowed_banner00172608814, range=23 (295,37,306)

a_shadowed_banner (100%)

frozenshadowa_shrouded_bat0325662576, range=53 (317,-5,355)

a_shrouded_bat (100%)

frozenshadowa_shrouded_bat0335738579, range=42 (356,45,355)

a_shrouded_bat (100%)

frozenshadowa_shrouded_bat0056012640, range=84 (397,63,355)

a_shrouded_bat (100%)

frozenshadowa_shadowbone02551038204, range=86 (401,43,-3)

a_shadowbone (100%)

frozenshadowa_shadow_beast00851191880, range=16 (314,33,-1)

a_shadow_beast (100%)

frozenshadow00061569174, range=71 (250,20,355)

(100%)