Oh, you're right. How about 10 ranks in each of the above skills and 12 in Concentration?
I think the spell level would depend on how many 10 ft cubes. How about 2 10 ft cubes?
As if hit by the burn ability of a Large fire elemental (2d6 fire damage)?
Does the fire stay there or revert to earth after some number of rounds?
Range?
Can it transform earth a character is standing on?
In any case, if we stick with 2d6 and limit the number of rounds, I'd guess about 4th level spell.
Revising...
Earth to Fire (Sp):
If a character is standing on earth that is transformed to fire, that character receives a DC X Reflex save to jump to an adjacent location; on a failed save, the character takes fire damage and catches fire as above.
The Companion Set version of these had "earth to fire" as an SLA, so this is to do that.

You're probably right about dropping into the pit. Since the fire can't be more than 10 ft deep, the falling damage would only be 1d6 and nothing most of the time. I'd rule that the fire is sort of "thick," negating the damage. But we can put in that they'd need to climb out or something.


(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.