NPCs composing that spawngroup :

a_drachnid_defiler (100%)

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

westkorlacha92198, range=129 (369,-1609,-22)

westkorlacha_monocle_2_5, range=107 (228,-1418,0)

westkorlacha_monocle_2_6, range=113 (188,-1459,0)

westkorlacha_monocle_2_7, range=114 (202,-1433,7)

westkorlacha_monocle_2_10, range=190 (482,-1510,-28)

westkorlacha_monocle_2_56, range=193 (475,-1565,-25)