In the renegade base after the Tower of Salvation, there is a thing that makes the Sorceror's Ring into a Radar. When you enable the radar, enemies turn invisible. Use the radar just as an enemy collides with you. After the battle, you will get a green screen, and then the game returns. The radar will seem to have not activated due to the lack of green tint. All enemies will be invisible.
Submitted by: AndyDark