NPCs composing that spawngroup :

an_iksar_spectre (50%)

a_tome_keeper (50%)

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

kaesora_10, range=81 (93,-440,-101)

skeletal_minion (100%)

kaesora_11, range=49 (92,-394,-99)

guardian_of_Xalgoz (50%)
skeletal_minion (50%)

kaesora_26, range=37 (136,-409,-98)

failed_crypt_raider (10%)
spectral_guardian (90%)

kaesora_43, range=76 (167,-441,-101)

skeletal_warder (100%)

kaesora_65, range=82 (57,-395,-68)

spectral_guardian (100%)

kaesora_66, range=32 (134,-404,-99)

spectral_guardian (100%)

kaesora_69, range=73 (179,-312,-109)

skeletal_warder (50%)
skeletal_warder (50%)

kaesora_72, range=94 (176,-285,-109)

minion_of_Xalgoz (50%)
skeletal_minion (50%)

kaesora_73, range=73 (150,-299,-109)

kaesora_87, range=92 (57,-323,-109)

kaesora_93, range=30 (115,-395,-98)

spectral_guardian (80%)
tortured_librarian (20%)

kaesora_94, range=47 (116,-415,-99)

spectral_guardian (80%)
spectral_librarian (20%)