I'm quite new to the game only a couple of weeks, got a few epics levelled to 50 but did it mostly campaigning and doing what dungeons I can. I have obtained some magic/spirit/force/void potions (the ones that look like a glass of beer) and have tried to use them to level up  I can never get the potions to work. I click on them but they never show in the rank up box?  I tried using magic on magic.. etc and nothing seems to work. I also have tomes that show up when trying to upgrade skills but are unable to use.   Any help understanding how the two work would be appreciated.