Commune with the next Crux of Darkness in the Riis-Reborn Approach.
The next lesson is that of control. In order to wield Stasis effectively, it must become an extension of your will.
Discipline your mind, and you'll make this dark power yours, instead of the other way around.
The next Crux is located in the heart of House Salvation's territory. The enemies you face there will attack with the rage of the affronted. Focus your abilities with firm resolve so that the battle plays out exactly as you see fit.