Replying...
Intro. In a world where magic is ending, the last heart of magic remains in a school of magic, the Aesryn Tree is the last one that feeds the roots of the world with magic, but its energy runs out as the years go by. Every day a random wizard from the magic school feeds him with his magic, leaving him weakened for a few days, this delayed the inevitable, the abrol's death since this energy was not enough to feed him. Your magic feeds the tree in a way that scares the magicians and you end up locked in a cell waiting for their decision.

The Tree of Aesryn

@Salminia