NPCs composing that spawngroup :

#Dread_Wraith (10%)

#Plaguebone_Warlord (10%)

an_apparition (55%)

plaguebone_skeleton (25%)

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

citymist_19, range=89 (-19,-38,1)

citymist_26, range=196 (-79,79,2)

citymist_30, range=65 (-85,-57,1)

citymist_47, range=46 (-62,-163,-8)

citymist_48, range=100 (-61,-217,5)

citymist_50, range=76 (1,-163,-9)

citymist_55, range=110 (24,-45,2)

citymist_67, range=130 (31,-24,274)

greater_war_boned_skeleton (100%)

citymist_68, range=75 (-30,-48,273)

citymist_69, range=161 (-195,-29,297)

citymist_70, range=155 (-172,-9,296)

citymist_71, range=106 (-160,-79,281)

a_mist_golem (100%)

citymist_72, range=104 (-143,-53,292)

citymist_73, range=142 (-189,-56,293)

greater_war_boned_skeleton (100%)

citymist_75, range=143 (-173,-205,273)

citymist_76, range=194 (-150,-289,270)

a_wraith (25%)

citymist_81, range=102 (-163,-125,273)

citymist_107, range=193 (-158,-284,76)

citymist_118, range=111 (-82,-8,5)

citymist_121, range=144 (-162,-15,-11)

citymist_124, range=151 (62,-207,1)

an_apparition (50%)
plaguebone_skeleton (50%)

citymist_131, range=168 (-13,45,28)

citymist_132, range=147 (-11,-256,7)

citymist_133, range=178 (13,46,28)

greater_plaguebone (25%)

citymist_134, range=182 (-202,-232,2)

citymist_155, range=170 (0,-277,4)

citymist_157, range=149 (-93,-263,3)

citymist_167, range=91 (-115,-190,4)

citymist_168, range=58 (-116,-133,4)

citymist_169, range=134 (-193,-94,3)

citymist_172, range=169 (102,-67,2)

citymist_173, range=188 (115,-188,3)

citymist_223157_takp_import_v0, range=165 (80,-29,273)

citymist_222990_takp_import_v0, range=101 (-99,-23,273)

citymist_222989_takp_import_v0, range=160 (-194,-28,295)

citymist_222984_takp_import_v0, range=136 (-190,-76,292)

citymist_223450_takp_import_v0, range=177 (-198,-230,5)

citymist_223158_takp_import_v0, range=159 (-174,-5,-13)

citymist_greater_plaguebone12_takp_import_v0, range=172 (-12,49,27)

greater_plaguebone (50%)
greater_plaguebone (50%)

citymist_222973_takp_import_v0, range=181 (13,49,28)

a_fog_golem (50%)
a_vapor_golem (50%)

citymist_222966_takp_import_v0, range=161 (-106,-273,5)

citymist_greater_spurbone86_takp_import_v0, range=194 (91,5,3)

greater_spurbone (50%)
greater_spurbone (50%)

citymist_222958_takp_import_v0, range=191 (117,-188,5)