NPCs composing that spawngroup :

an_ire_ghast (100%)

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

spawn24297, range=29 (102,-50,128)

spawn24296, range=93 (144,5,103)

spawn17987, range=30 (94,-108,6)

spawn16732, range=37 (104,-116,103)

spawn13523, range=57 (133,-30,4)

spawn11348, range=87 (28,-125,103)

spawn10233, range=66 (40,-55,99)

A_blood_189317, range=58 (157,-99,101)

Suddenly_189344, range=89 (31,-25,16)