NPCs composing that spawngroup :

an_undead_jester (20%)

thick_boned_skeleton (80%)

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

kurn_1, range=83 (73,133,3)

greater_skeleton (100%)

kurn_8, range=50 (99,9,4)

kurn_11, range=85 (110,143,3)

greater_scalebone (50%)
greater_skeleton (50%)

kurn_15, range=90 (82,143,3)

kurn_16, range=66 (169,31,-134)

lesser_charbone_skeleton (50%)
lesser_icebone_skeleton (50%)

kurn_34, range=91 (21,86,-116)

lesser_charbone_skeleton (100%)

kurn_56, range=76 (171,14,-120)

kurn_58, range=72 (180,46,-119)

Burynai_Excavator (50%)
Burynai_sapper (50%)

kurn_59, range=77 (139,129,-116)

Burynai_excavator (50%)
Burynai_sapper (50%)

kurn_64, range=80 (178,16,-120)

kurn_65, range=84 (166,121,-116)

kurn_74, range=72 (38,70,-116)

kurn_94, range=87 (67,-19,-39)

kurn_99, range=73 (124,-14,-49)

kurn_104, range=79 (154,123,-39)

kurn_115, range=28 (137,58,-39)

Burynai_Excavator (50%)
lesser_icebone_skeleton (50%)

kurn_160, range=69 (66,3,9)

greater_skeleton (100%)

kurn_174, range=23 (130,47,104)

kurn_186, range=89 (29,19,104)

kurn_189, range=18 (93,48,104)

kurn_190, range=21 (93,73,104)