NPCs composing that spawngroup :

#A_Mighty_Golem (20%)

a_fog_golem (20%)

a_fog_golem (20%)

a_mist_golem (20%)

a_vapor_golem (20%)

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

citymist_3, range=28 (0,387,94)

#Tzirathk (30%)
a_black_reaver (70%)

citymist_4, range=42 (16,350,96)

a_black_reaver (100%)
a_black_reaver (100%)

citymist_5, range=42 (20,368,4)

citymist_8, range=21 (-11,387,75)

citymist_9, range=37 (11,387,77)

citymist_11, range=87 (28,440,3)

citymist_12, range=56 (21,405,4)

citymist_13, range=36 (-21,405,4)

citymist_14, range=47 (22,387,4)

citymist_18, range=18 (-20,387,4)

citymist_22, range=95 (-46,277,4)

citymist_112, range=89 (-97,417,5)

citymist_a_black_reaver2_takp_import_v0, range=28 (0,387,94)

citymist_223157_takp_import_v0, range=22 (-25,391,81)

gyrating_goo (100%)

citymist_222986_takp_import_v0, range=21 (-10,387,77)

citymist_222983_takp_import_v0, range=54 (-1,319,96)

a_black_reaver (100%)

citymist_222992_takp_import_v0, range=22 (0,372,94)

a_fog_golem (50%)
a_wraith (25%)
a_wraith (25%)

citymist_222970_takp_import_v0, range=43 (21,369,3)

citymist_222979_takp_import_v0, range=56 (1,421,6)

a_black_reaver (100%)

citymist_greater_plaguebone12_takp_import_v0, range=47 (22,387,3)

greater_plaguebone (50%)
greater_plaguebone (50%)

citymist_222978_takp_import_v0, range=36 (-20,405,4)

a_fog_golem (50%)
a_fog_golem (50%)
a_phantom (25%)
a_phantom (25%)
a_phantom (25%)
a_phantom (25%)

citymist_a_black_reaver005_10091865, range=56 (1,420,5)

a_black_reaver (100%)

citymist_a_black_reaver005_10244843, range=50 (-1,322,95)

a_black_reaver (100%)