Jonathan Drain |
As far as I know it only applies to a Huge elemental - not elder elementals, or different creatures of the Elemental type. I once had someone argue that you could turn into a half-elemental marilith, which is clearly not the intent of the druid's ability.
I also pointed out to him that a half-elemental was actually an outsider type rather than an elemental type, and that I knew this because it was in an article in Dragon magazine, and I wrote the article.