Rorzakh Staffs of Presence had the longest-lasting effects, allowing the Vahki to see and hear whatever the affected Matoran did without the Matoran being aware of it.1
Notes
The Rorzakh's Staffs of Presence allowed them to see and hear whatever their target saw or heard.2
Rorzakh stun staffs had the longest-lasting effects, allowing the Vahki to see and hear whatever the affected Matoran did without the Matoran being aware of it.3