Speaking about Magia Erebea is it just me that thinks the situation that seems to be forming up inside Mahora Academy with the World Tree starting to act up, and in the worst case it could blow up, taking the Academy with it is the perfect stage for Negi to use his Magia Erebea's absorption technique .
Well I doubt Negi would be able to take all of the World Tree's energies, I think that he could be able to reduce the amount of magical energy contained inside the tree, which would reduce the risk of the Mahora Academy being blown up.
Another thing that I wanted to mention is that I found some spoiler's about chapter 290 already, while I'm not sure how accurate they are, it might make some people around here a little less ... impatient so here you go: