NPCs composing that spawngroup :

guardian_of_Xalgoz (50%)

skeletal_minion (50%)

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

kaesora_10, range=46 (93,-440,-101)

skeletal_minion (100%)

kaesora_26, range=47 (136,-409,-98)

failed_crypt_raider (10%)
spectral_guardian (90%)

kaesora_43, range=89 (167,-441,-101)

skeletal_warder (100%)

kaesora_51, range=91 (9,-356,-101)

skeletal_warder (100%)

kaesora_65, range=35 (57,-395,-68)

spectral_guardian (100%)

kaesora_66, range=43 (134,-404,-99)

spectral_guardian (100%)

kaesora_74, range=49 (136,-371,-73)

an_iksar_spectre (50%)
a_tome_keeper (50%)

kaesora_87, range=79 (57,-323,-109)

kaesora_93, range=23 (115,-395,-98)

spectral_guardian (80%)
tortured_librarian (20%)

kaesora_94, range=31 (116,-415,-99)

spectral_guardian (80%)
spectral_librarian (20%)