NPCs composing that spawngroup :

#Cubicularius_Wringordus (20%)

A_Dark_Sending (80%)

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

griegsend_Gasha_Mraal260, range=64 (-75,2903,-54)

#Gesha_Mraal (10%)
Gasha_Mraal (90%)

griegsend_An_Atra_Somnium9, range=47 (-56,2888,-55)

An_Atra_Somnium (100%)

griegsend_A_Dark_Sending3, range=75 (13,2864,-55)

griegsend_A_Singultus_Proeliator267, range=25 (-47,2864,-55)

#Singultus_Primorus (4%)
A_Singultus_Proeliator (96%)

griegsend_225088, range=75 (-18,2904,-55)

A_Dark_Sending (100%)

griegsend_225218, range=34 (-88,2822,-55)

#Abluo_Mulier (10%)
A_Dark_Sending (90%)