The Planes

Those are para-quasi-elemental planes.

I include two pseudo-elemental planes between the opposing elemental planes. I use Steam as the mixture between Fire and Water, and Sand between Earth and Air. Steam is a hot, high pressure plane (think pressure cooker), and Sand is an eternal sandstorm. I rename the Positive/Water Quasi plane as Mist, since that makes more sense with the description.

I do like the idea of putting Acid in the Pos/Water Quasi slot, to represent reactive water.

In fact, I think that infusing positive energy into water would give it the properties of both a base and an acid simultaneously, which would, of course, be very nasty.

PS, Mak, if you wrap tags around your chart (and leave HTML on), it will use your original spacing. Otherwise it defaults to a maximum of one space between words and no spaces at the start of lines.