NPCs composing that spawngroup :

a_kerra_spider (100%)

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

erudsxing_15, range=139 (-1244,1453,-40)

a_kerra_snake (100%)
a_kerra_snake (100%)

erudsxing_16, range=167 (-1212,1192,104)

erudsxing_17, range=89 (-1212,1283,-2)

a_vampire_bat (100%)

erudsxing_9, range=180 (-1304,1252,96)

a_kerra_spider (50%)
a_vampire_bat (50%)

erudsxing_10, range=108 (-1153,1457,120)

erudsxing_32, range=187 (-1339,1359,123)

a_vampire_bat (100%)

erudsxing_33, range=139 (-1244,1452,128)

erudsxing_34, range=165 (-1307,1407,129)

Hojo (100%)

erudsxing_42, range=145 (-1295,1371,118)

a_willowisp (50%)
a_willowisp (50%)

erudsxing_44, range=111 (-1175,1239,55)

Yelesom_Paust (100%)