NPCs composing that spawngroup :

an_iksar_spectre (50%)

a_tome_keeper (50%)

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

kaesora_spectral_guardian5, range=92 (57,-322,-107)

spectral_guardian (50%)
spectral_guardian (50%)

kaesora_skeletal_minion71, range=73 (150,-298,-109)

skeletal_minion (50%)
skeletal_minion (50%)

kaesora_minion_of_Xalgoz2, range=94 (176,-284,-109)

minion_of_Xalgoz (50%)
minion_of_Xalgoz (50%)

kaesora_guardian_of_Xalgoz1, range=45 (97,-393,-99)

kaesora_failed_crypt_raider0, range=32 (116,-396,-101)

kaesora_222715, range=75 (77,-417,-101)

kaesora_222716, range=73 (115,-440,-101)

kaesora_225826, range=71 (181,-314,-109)

skeletal_warder (98%)
warder_of_Xalgoz (2%)