NPCs composing that spawngroup :

Burynai_excavator (50%)

Burynai_sapper (50%)

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

kurn_1, range=65 (73,133,3)

greater_skeleton (100%)

kurn_9, range=58 (97,170,21)

scalebone_skeleton (100%)

kurn_11, range=31 (110,143,3)

greater_scalebone (50%)
greater_skeleton (50%)

kurn_13, range=67 (162,192,3)

kurn_15, range=58 (82,143,3)

kurn_22, range=46 (140,175,3)

kurn_58, range=92 (180,46,-119)

Burynai_Excavator (50%)
Burynai_sapper (50%)

kurn_60, range=50 (152,177,-116)

Burynai_sapper (100%)

kurn_61, range=53 (165,176,-116)

Burynai_excavator (50%)
lesser_icebone_skeleton (50%)

kurn_62, range=91 (64,182,-116)

kurn_65, range=28 (166,121,-116)

kurn_95, range=86 (224,142,-39)

Burynai_excavator (100%)

kurn_104, range=16 (154,123,-39)

kurn_115, range=70 (137,58,-39)

Burynai_Excavator (50%)
lesser_icebone_skeleton (50%)

kurn_174, range=82 (130,47,104)

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

kurn_190, range=72 (93,73,104)

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

an_undead_jester (20%)
thick_boned_skeleton (80%)