NPCs composing that spawngroup :

lesser_charbone_skeleton (50%)

lesser_icebone_skeleton (50%)

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

kurn_8, range=73 (99,9,4)

kurn_56, range=17 (171,14,-120)

kurn_57, range=59 (188,-26,-118)

greater_scalebone (100%)

kurn_58, range=18 (180,46,-119)

Burynai_Excavator (50%)
Burynai_sapper (50%)

kurn_64, range=17 (178,16,-120)

kurn_65, range=90 (166,121,-116)

kurn_76, range=90 (223,-41,-118)

Burynai_excavator (50%)
Burynai_sapper (50%)

kurn_97, range=91 (128,-51,-49)

kurn_98, range=99 (104,-44,-49)

kurn_99, range=63 (124,-14,-49)

kurn_104, range=93 (154,123,-39)

kurn_115, range=42 (137,58,-39)

Burynai_Excavator (50%)
lesser_icebone_skeleton (50%)

kurn_174, range=42 (130,47,104)

kurn_182, range=79 (137,-42,9)

scalebone_skeleton (100%)

kurn_189, range=77 (93,48,104)

kurn_190, range=86 (93,73,104)

kurn_191, range=65 (109,58,-39)

an_undead_jester (20%)
thick_boned_skeleton (80%)