NPCs composing that spawngroup :

spectral_guardian (80%)

spectral_librarian (20%)

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

kaesora_10, range=33 (93,-440,-101)

skeletal_minion (100%)

kaesora_11, range=31 (92,-394,-99)

guardian_of_Xalgoz (50%)
skeletal_minion (50%)

kaesora_26, range=21 (136,-409,-98)

failed_crypt_raider (10%)
spectral_guardian (90%)

kaesora_37, range=175 (178,-579,-109)

skeletal_warder (100%)
skeletal_warder (100%)

kaesora_43, range=57 (167,-441,-101)

skeletal_warder (100%)

kaesora_51, range=122 (9,-356,-101)

skeletal_warder (100%)

kaesora_52, range=126 (40,-516,-107)

kaesora_53, range=112 (63,-514,-109)

kaesora_54, range=121 (46,-514,-106)

kaesora_55, range=103 (51,-495,-109)

kaesora_58, range=189 (141,-603,-108)

kaesora_65, range=62 (57,-395,-68)

spectral_guardian (100%)

kaesora_66, range=22 (134,-404,-99)

spectral_guardian (100%)

kaesora_67, range=181 (258,-302,-108)

kaesora_68, range=155 (219,-298,-108)

kaesora_69, range=121 (179,-312,-109)

skeletal_warder (50%)
skeletal_warder (50%)

kaesora_70, range=152 (246,-336,-108)

minion_of_Xalgoz (100%)

kaesora_71, range=164 (263,-341,-106)

kaesora_72, range=143 (176,-285,-109)

minion_of_Xalgoz (50%)
skeletal_minion (50%)

kaesora_73, range=120 (150,-299,-109)

kaesora_74, range=48 (136,-371,-73)

an_iksar_spectre (50%)
a_tome_keeper (50%)

kaesora_87, range=109 (57,-323,-109)

kaesora_93, range=20 (115,-395,-98)

spectral_guardian (80%)
tortured_librarian (20%)