NPCs composing that spawngroup :

a_loathling_lich (100%)

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

spawn19758, range=61 (-159,-267,6)

spawn16743, range=28 (-221,-311,5)

spawn16739, range=34 (-205,-286,5)

spawn16737, range=94 (-167,-227,30)