While denying reality, Toz tried to put the Fountain of Death into another ring. After doing that three more times, he groaned in agony. He had ruined all his rings, and it was all for nothing. The Fountain of Death couldn't be put into a spatial storage item. It was infuriating and annoying, but it wouldn't be the end of Toz.
Toz put down the Fountain of Death after draining the heat from right below it. After that, he spread the flames and heat of the lava pool even further so that he could get some time to think about what to do.
Since he didn't know if the Fountain of Death resisted all kinds of spatial manipulation or just storage items, Toz didn't dare to try and teleport it. Doing that would also require Asilean's assistance. And asking him for help when he and the other cats were busy wasn't something Toz wanted to do unless absolutely necessary.