The 3rd stage of the annual John Van Caneghem Tournament (2007).

No, we need to find the Sphere of Permanence.

I'd like to know from Fireball how to kill a 260 HP creature on the eighth day?

Well, it's clear that the Sphere of Permanence... the map with the Sphere of the Dragon is called that. So, the Sphere of Permanence is the Sphere of the Dragon.