Hey guys, I noticed that after unlocking every skill of the last phase, I cannot level another skill. After every battle it says that I unlocked a new skill but it doesn't level any other skills.
That's because you've unlocked every skills you could in battle.
For the remaining skills, you should try to read some books to learn new tricks ;)
Ahh ok, thanks a lot for the fast reply and thanks for the awesome game. :)