All the spell he got is something he learned, he got no skills from his sage class so he's learning magic on his own and using them all via the cube. The dark magic is sealed on the cube and the moment the cube got destroyed it automatically activates. Spells and skills aren't the same. Spells...
Guess who's back with a fresh chapter? It's me the hated "sniper" anyways I don't know when I should delete the previous chapter here in manga dex.
Edit: I forgot to mention official tl of volume 1 is now available. You can buy it at Amazon.