NPCs composing that spawngroup :

bristleweb_spider (33%)

strathbone_spider (33%)

strathbone_spider (34%)

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

kaesora_3, range=90 (136,170,-69)

bristleweb_spider (100%)

kaesora_4, range=91 (148,172,-69)

kaesora_5, range=19 (145,62,-61)

kaesora_7, range=42 (135,40,-61)

bristleweb_spider (50%)
strathbone_healer (50%)

kaesora_8, range=61 (148,142,-64)

kaesora_9, range=29 (175,71,-61)

kaesora_12, range=27 (120,74,-61)

briarweb_spider (50%)
ravener (50%)

kaesora_28, range=68 (88,117,35)

minion_of_Xalgoz (50%)
spectral_guardian (50%)