NPCs composing that spawngroup :

Burynai_burrower (25%)

Burynai_excavator (25%)

Burynai_Excavator (25%)

greater_skeleton (25%)

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

kurn_1, range=36 (-121,-186,6)

greater_skeleton (100%)
greater_skeleton (100%)

kurn_7, range=74 (-90,-254,3)

kurn_8, range=64 (-142,-272,4)

kurn_19, range=78 (-143,-130,-117)

kurn_20, range=58 (-138,-151,-117)

kurn_24, range=75 (-224,-212,-27)

Burynai_Excavator (50%)
Burynai_Excavator (50%)

kurn_29, range=84 (-65,-212,3)

kurn_70, range=93 (-72,-155,-105)

kurn_73, range=48 (-108,-233,-23)

kurn_80, range=77 (-72,-208,-23)

kurn_113, range=66 (-87,-231,-22)

Burynai_burrower (50%)
Burynai_excavator (50%)

kurn_130, range=30 (-143,-238,-23)

kurn_131, range=72 (-108,-268,-23)

kurn_138, range=99 (-50,-210,-23)

kurn_144, range=91 (-141,-299,-22)

kurn_164, range=70 (-83,-232,123)

kurn_171, range=66 (-83,-200,123)

kurn_172, range=77 (-89,-159,88)

kurn_173, range=94 (-55,-201,88)

kurn_276925, range=99 (-50,-219,134)

greater_skeleton (90%)
undead_crusader (10%)