NPCs composing that spawngroup :

skeletal_minion (100%)

NPCs spawning around that spawngroup :
(Max range : 200)

kaesora_5, range=130 (145,62,-61)

kaesora_6, range=147 (147,81,-61)

kaesora_7, range=115 (135,40,-61)

bristleweb_spider (50%)
strathbone_healer (50%)

kaesora_9, range=130 (175,71,-61)

kaesora_12, range=152 (120,74,-61)

briarweb_spider (50%)
ravener (50%)

kaesora_26, range=137 (297,-153,-123)

failed_crypt_raider (10%)
spectral_guardian (90%)

kaesora_27, range=155 (344,-8,3)

kaesora_29, range=104 (97,-85,3)

kaesora_30, range=145 (55,-33,3)

kaesora_31, range=76 (126,-83,3)

kaesora_32, range=153 (215,-210,-113)

kaesora_33, range=141 (111,-168,-27)

kaesora_34, range=162 (120,-200,-29)

kaesora_35, range=120 (153,-169,-27)

kaesora_36, range=156 (42,-63,3)

kaesora_60, range=55 (153,-89,3)

kaesora_61, range=89 (242,-135,-125)

kaesora_62, range=119 (246,-166,-123)

kaesora_63, range=98 (296,-50,-173)

skeletal_minion (100%)

kaesora_88, range=148 (247,-197,3)

kaesora_89, range=148 (341,-98,5)

kaesora_91, range=162 (284,-195,3)