The next five days I spend hunting. We cleared the wolves den three more times, then goblin cave once, and finally rats nest. I got the points I needed to unlock the Shadow baron. This gave me access to three more skills: second 'Void essence', 'Shadow summoning', 'Void authority'.
I made a mistake and immediately upgraded them as high as possible. Two hundred upgrades of 'Void essence' for a total of 200 000 points, then 'Shadow summoning' and 'Void authority' for a total of 222 000, all mostly covered by what I earned during those days. It was a mistake because I had no idea what 'Void authority' was for. I couldn't activate the skill for some reason.
I also discovered that although my pool of shadow essence was one, it seemed that classes unlocked a limited option to upgrade it, so basically, even two skills of an identical name, affected the same thing. Every other type of energy I had access to seemed to be exactly the same case.
