NPCs composing that spawngroup :

Burynai_excavator (33%)

Burynai_sapper (34%)

greater_scalebone (33%)

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

kurn_8, range=72 (99,9,4)

kurn_16, range=17 (169,31,-134)

lesser_charbone_skeleton (50%)
lesser_icebone_skeleton (50%)

kurn_40, range=89 (153,-74,-104)

kurn_57, range=43 (188,-26,-118)

greater_scalebone (100%)

kurn_58, range=33 (180,46,-119)

Burynai_Excavator (50%)
Burynai_sapper (50%)

kurn_64, range=7 (178,16,-120)

kurn_75, range=99 (248,-49,-118)

Burynai_sapper (50%)
lesser_icebone_skeleton (50%)

kurn_76, range=75 (223,-41,-118)

Burynai_excavator (50%)
Burynai_sapper (50%)

kurn_88, range=97 (155,-83,-24)

Burynai_burrower (50%)
Burynai_Excavator (50%)

kurn_97, range=77 (128,-51,-49)

kurn_98, range=88 (104,-44,-49)

kurn_99, range=54 (124,-14,-49)

kurn_107, range=98 (121,-71,-24)

kurn_115, range=56 (137,58,-39)

Burynai_Excavator (50%)
lesser_icebone_skeleton (50%)

kurn_174, range=52 (130,47,104)

kurn_182, range=65 (137,-42,9)

scalebone_skeleton (100%)

kurn_189, range=85 (93,48,104)

kurn_190, range=97 (93,73,104)

kurn_191, range=76 (109,58,-39)

an_undead_jester (20%)
thick_boned_skeleton (80%)