NPCs composing that spawngroup :

#Crackling_Bones (25%)

lesser_charbone_skeleton (75%)

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

kurn_1, range=67 (-53,144,4)

greater_skeleton (100%)

kurn_6, range=83 (-84,144,3)

kurn_9, range=73 (0,13,3)

scalebone_skeleton (100%)

kurn_18, range=62 (-70,30,-39)

Burynai_excavator (100%)

kurn_34, range=53 (21,86,-116)

lesser_charbone_skeleton (100%)

kurn_44, range=55 (-9,29,-116)

kurn_74, range=69 (38,70,-116)

kurn_91, range=72 (-30,8,-39)

kurn_119, range=83 (-37,163,-49)

Burynai_excavator (50%)
Burynai_Excavator (50%)

kurn_120, range=70 (-9,147,-49)

kurn_132, range=25 (-8,70,-39)

Burynai_excavator (50%)
Burynai_sapper (50%)

kurn_133, range=20 (-51,77,-39)

kurn_134, range=55 (-84,61,-39)

Burynai_Excavator (50%)
Burynai_Excavator (50%)

kurn_149, range=77 (-63,9,-30)

kurn_150, range=80 (-111,72,-39)

Burynai_excavator (100%)

kurn_151, range=97 (-106,18,-39)

kurn_153, range=95 (-62,-10,-30)

kurn_160, range=81 (-53,1,9)

greater_skeleton (100%)

kurn_166, range=45 (-50,39,104)

kurn_183, range=50 (13,104,6)

greater_skeleton (100%)

kurn_184, range=56 (-85,61,106)

greater_skeleton (50%)
scalebone_skeleton (50%)

kurn_185, range=92 (-39,-12,104)

kurn_186, range=85 (29,19,104)

kurn_188, range=54 (-13,29,104)

greater_skeleton (50%)
scalebone_skeleton (50%)

kurn_192, range=57 (0,31,-39)

fingered_skeleton (20%)
thick_boned_skeleton (80%)

kurn_193, range=48 (-35,31,-39)

thick_boned_skeleton (100%)