NPCs composing that spawngroup :

briarweb_spider (33%)

strathbone_spider (33%)

strathbone_spider (34%)

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

kaesora_5, range=154 (145,62,-61)

kaesora_6, range=173 (147,81,-61)

kaesora_7, range=131 (135,40,-61)

bristleweb_spider (50%)
strathbone_healer (50%)

kaesora_9, range=174 (175,71,-61)

kaesora_12, range=160 (120,74,-61)

briarweb_spider (50%)
ravener (50%)

kaesora_27, range=172 (240,-181,3)

kaesora_30, range=66 (55,-33,3)

kaesora_31, range=29 (126,-83,3)

kaesora_32, range=172 (215,-210,-113)

kaesora_33, range=84 (111,-168,-27)

kaesora_34, range=117 (120,-200,-29)

kaesora_35, range=100 (153,-169,-27)

kaesora_36, range=59 (42,-63,3)

kaesora_60, range=56 (153,-89,3)

kaesora_61, range=153 (242,-135,-125)

kaesora_62, range=169 (246,-166,-123)

kaesora_64, range=105 (198,-57,-125)

skeletal_minion (100%)

kaesora_88, range=187 (247,-197,3)