Good catch! I fixed the kryst, using clump.
Since they use many SLAs, I'm thinking we should put some ranks in Concentration. Otherwise, I like your skill choices.
Let's figure out the equivalent level of earth to fire before selecting feats, as it could affect Quicken or Empower SLA should we want them.
Earth to Fire (Sp): Three times per day, a helion may transform x 10-foot-cubes of earth 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. This is the equivalent of an Xth-level spell. (Reflex save DC will be a product of equivalent spell level).