freyar
Extradimensional Explorer
So...
Earth to Fire (Sp): Three times per day, a helion may transform 2 10-foot-cubes of earth (or smaller cubes, totalling no more than 200 cubic feet) within close range (45 ft) into elemental fire of equal size. Creatures hitting touching the fire take fire damage as though hit by the burn ability of a fire elemental of equivalent size, and also catch on fire unless they succeed on a DC X Reflex save. If a creature is standing on earth that is transformed to fire, that creature 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, and must succeed on a DC X Climb check in the following round or suffer fire damage for an additional round.
Creatures of the earth subtype must succeed on a DC X Reflex save or take x points of fire damage. Earth elementals that fail their saves are transformed into a fire elemental of the same size for x rounds.
We need to add something to the second paragraph to say how earth subtype creatures are targeted. "Creatures of the earth subtype standing on transformed earth..." or "A creature of the earth subtype may be targeted instead of a cube of earth (One Large creature is equivalent to one 10 ft cube of earth, 4 Medium, etc.)" Which do you prefer?