NPCs composing that spawngroup :

a_fog_golem (50%)

greater_spurbone (25%)

greater_spurbone (25%)

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

citymist_50076126, range=83 (133,-352,41)

an_apparition (50%)
an_apparition (50%)

citymist_50076130, range=58 (152,-371,41)

citymist_50076131, range=53 (225,-425,41)

citymist_50076132, range=95 (198,-334,-11)

citymist_50076133, range=76 (182,-350,63)

citymist_50076136, range=53 (210,-389,274)

citymist_50076141, range=89 (215,-348,63)

citymist_50076150, range=88 (117,-357,247)

a_mist_golem (50%)
a_wraith (25%)
a_wraith (25%)

citymist_50076152, range=76 (182,-350,65)

a_phantom (50%)
a_phantom (50%)

citymist_50076153, range=26 (198,-424,4)

citymist_50076158, range=41 (199,-395,273)

citymist_50076162, range=54 (226,-424,4)

citymist_50076167, range=1 (171,-425,3)

greater_spurbone (50%)
greater_spurbone (50%)

citymist_50076168, range=92 (136,-341,275)

citymist_50076169, range=91 (115,-354,75)

gyrating_goo (100%)

citymist_50076170, range=95 (147,-334,273)