NPCs composing that spawngroup :

#Howling_Spectre (25%)

a_mortiferous_golem (25%)

a_pulsating_bile (25%)

a_sepulcher_spirit (25%)

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

charasis_5, range=187 (217,-351,22)

hexbone_skeleton (100%)

charasis_10, range=198 (152,-404,24)

charasis_12, range=106 (12,-294,22)

elementalbone_skeleton (50%)
hexbone_skeleton (50%)

charasis_15, range=187 (101,-404,23)

charasis_20, range=196 (28,-405,22)

charasis_22, range=99 (6,-276,23)

charasis_23, range=59 (79,-276,22)

charasis_24, range=97 (139,-299,21)

charasis_25, range=34 (85,-183,22)

charasis_27, range=101 (12,-147,22)

a_pyre_golem (50%)
a_pyre_golem (50%)

charasis_29, range=120 (-12,-147,22)

charasis_30, range=137 (-1,-111,21)

a_pulsating_bile (50%)
hexbone_skeleton (50%)

charasis_31, range=58 (52,-170,23)

charasis_32, range=34 (52,-225,22)

charasis_33, range=114 (-28,-207,22)

charasis_112, range=86 (-1,-224,-194)

a_sepulcher_skeleton (100%)

charasis_173, range=64 (63,-278,-176)

charasis_174, range=73 (45,-279,-194)

greater_war_boned_skeleton (100%)

charasis_175, range=68 (25,-185,-194)

charasis_176, range=115 (-25,-185,-194)

charasis_177, range=55 (31,-225,-194)

a_sepulcher_skeleton (100%)

charasis_204, range=149 (14,-348,22)

hexbone_skeleton (100%)

charasis_209, range=31 (116,-224,23)

a_helot_spectre (100%)

charasis_Acolyte_of_Convergence000_1949931, range=192 (46,-29,4)

Acolyte_of_Convergence (100%)