I was thinking of having cliffs all over the volcano so that, as the lava rises, a non-flying and non-levitating Pokémon can still save itself from the eruption.
Also, I'd say not an OHKO, but, grievous damage that ignores the caps. 50% fire-type damage, perhaps.
Also, I'd say not an OHKO, but, grievous damage that ignores the caps. 50% fire-type damage, perhaps.