Ninja Gaiden BLACK: Hint - Essence Farming (Chapter 13)

During the game’s thirteenth chapter, you will leave the aqueduct and head across a drawbridge. Here, you will encounter a trio of Mercenary Fiends. Run away and charge up your True Dragon Sword/Unlabored Flawlessness UT. Use it on the foes as soon as they’re in range. Block, roll away, and repeat the process as necessary. With the Armlet of Benediction equipped, you can get about 8,500 essence per enemy. You can easily max out with this technique in twenty minutes.