NPCs composing that spawngroup :

#Custos_Valka (33%)

#Vigulum_Pola (33%)

#Watcher_Wilta (34%)

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

sseru_A_Custos_of_Seru152, range=98 (-1775,-1544,59)

A_Custos_of_Seru (100%)

sseru_#Watcher_Quen507, range=92 (-1957,-1537,58)