Daverson said:
Erm, point 4, I don't think you can make assumptions of the "science" behind ME, considering their magical crystal are "Element Zero".
For those of us who apparently don't know what science is, elements in the periodic table are numbered by the number of protons they've got in their nucleus. So, Element 1 (Hydrogen) has a single proton in the nucleus, while element 13 (aluminium) has 13. Element 0 isn't something that's physically impossible, it's literally nothing! You can't have nothing as your magical crystals!
And it's not like it's just called "Element Zero", but it's something else entirely, they go out of their way to say that's exactly what it is! I'm pretty sure this is the first thing you learn in chemistry classes these days!
There are various exotic forms of matter outside the domain of chemistry and the periodic table. For example, neutron stars are made out of neutronium, a material that has no protons or electrons and is a ~100 billion times more dense than any matter on the periodic table. In fact, the chemist who first hypothesized the existence of neutronium placed it on his periodic table as "element zero", although of course that didn't catch on.
http://en.wikipedia.org/wiki/Neutronium
Another possibility is the "dark matter" that is studied in astronomy and cosmology. Dark matter is not made of protons, in fact one of the things that made us look for dark matter is that someone realized that the visible universe has only ~10^80 protons and that this is not enough to account for the accelerating expansion of the universe - two other independent things that led us to dark matter were the rotation speeds of galaxies and an effect called gravitational lensing, but the "not enough protons" problem was definitely part of it.
As a more general framework for exotic matter, recall that protons and neutrons are made of quarks. There are six quarks (up, down, charmed, strange, top, bottom) but protons and neutrons only involve up/down and their respective antiparticles. Charmed, strange, top, and bottom are generated in particle accelerators. For example, omega baryons are like heavier cousins of protons, made out of strange and charmed quarks instead of up and down quarks.
Sorry for going on so long. The point is that the periodic table does not describe everything, not even close. It's estimated that 90% of the total mass in the universe is dark matter, not found on the periodic table.