NPCs composing that spawngroup :

an_undead_bridesmaid (100%)

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

frozenshadow_80, range=59 (347,-133,218)

a_golem_usher (50%)
a_golem_usher (50%)

frozenshadow_85, range=43 (301,-132,219)

frozenshadow_86, range=54 (273,-133,219)

a_golem_usher (100%)

frozenshadow_87, range=93 (273,-177,219)

frozenshadow_105, range=13 (298,-100,218)

an_undead_bridesmaid (50%)
an_undead_bridesmaid (50%)

frozenshadow_107, range=18 (288,-92,218)

an_undead_bridesmaid (50%)
an_undead_bridesmaid (50%)

frozenshadow_108, range=15 (319,-81,218)

an_undead_bridesmaid (50%)
an_undead_bridesmaid (50%)

frozenshadow_118, range=91 (382,-40,218)

an_undead_dancer (50%)
an_undead_dancer (50%)

frozenshadow_149, range=69 (293,-21,306)

a_shadowed_banner (100%)

frozenshadow#an_undead_usher000169956537, range=79 (373,-131,218)

#an_undead_usher (50%)
#The_Head_Usher (50%)

frozenshadowa_golem_usher01166240899, range=87 (301,-176,219)

a_golem_usher (100%)

frozenshadowa_golem_usher01266280117, range=60 (362,-68,218)

a_golem_usher (100%)

frozenshadowa_golem_usher01366304204, range=44 (329,-128,218)

a_golem_usher (100%)

frozenshadowan_undead_dancer00866624394, range=86 (373,-35,218)

an_undead_dancer (100%)

frozenshadowa_golem_usher00366789177, range=92 (329,-179,219)

a_golem_usher (100%)

frozenshadowa_golem_usher00166928017, range=92 (397,-105,218)

a_golem_usher (100%)

frozenshadowa_golem_usher01167279205, range=96 (348,-176,218)

a_golem_usher (100%)

frozenshadowan_undead_bridesmaid00367438934, range=22 (286,-78,218)

an_undead_bridesmaid (100%)

frozenshadowa_frost_familiar00475713157, range=81 (384,-66,306)

a_frost_familiar (100%)

frozenshadowa_shrouded_bat0325662576, range=85 (317,-5,355)

a_shrouded_bat (100%)