NPCs composing that spawngroup :

skeletal_minion (100%)

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

kaesora_11, range=46 (92,-394,-99)

guardian_of_Xalgoz (50%)
skeletal_minion (50%)

kaesora_26, range=53 (136,-409,-98)

failed_crypt_raider (10%)
spectral_guardian (90%)

kaesora_43, range=74 (167,-441,-101)

skeletal_warder (100%)

kaesora_52, range=92 (40,-516,-107)

kaesora_53, range=79 (63,-514,-109)

kaesora_54, range=87 (46,-514,-106)

kaesora_55, range=69 (51,-495,-109)

kaesora_65, range=58 (57,-395,-68)

spectral_guardian (100%)

kaesora_66, range=55 (134,-404,-99)

spectral_guardian (100%)

kaesora_74, range=81 (136,-371,-73)

an_iksar_spectre (50%)
a_tome_keeper (50%)

kaesora_93, range=51 (115,-395,-98)

spectral_guardian (80%)
tortured_librarian (20%)

kaesora_94, range=34 (116,-415,-99)

spectral_guardian (80%)
spectral_librarian (20%)