It was introduced in Sandstorm. Not a common source, I admit, but interesting.Also, I wasn't aware that there was such a thing as "Dessication" damage. I thought that it fell under Negative Energy.
Probably, but even if there isn't...Also, I am unaware of a Positive Energy spell that harms an opponent, though there likely is one.
"I charge my sword!"
"Hey, I feel better!"
So where's the Elemental Plane of Acid? Elemental Plane of Sonic? Heck, in standard cosmology, Positive and Negative have their own planes situated similarly to Air, Earth, Fire, and Water, so they're arguably more of an element than Acid, Cold, Electricity, or Sonic. D&D elements don't really make sense, and what's considered an element is entirely arbitrary.Nevertheless, this class is the Elemental Blade, not the Energy Blade. It could potentially be expanded, but I wouldn't do so without some consideration. Additionally, Negative and Positive seem more like they'd be used with a Divine version of this class...