MarkB
Legend
Did you know that volcanic eruptions can generate lightning within their plumes?
Put the wizard in a floating castle hovering within the ash plume above an erupting volcano harnessing its energy for his own schemes, and you've got a whole range of environmental features to play with. You could bring in red and blue dragons competing for dominance of the territory, portals opening to the elemental planes of Fire, Air and Earth, and a risk of causing more harm than good if the wizard's experiment is interrupted in the wrong way.
Put the wizard in a floating castle hovering within the ash plume above an erupting volcano harnessing its energy for his own schemes, and you've got a whole range of environmental features to play with. You could bring in red and blue dragons competing for dominance of the territory, portals opening to the elemental planes of Fire, Air and Earth, and a risk of causing more harm than good if the wizard's experiment is interrupted in the wrong way.