Elements are "Mono-Elementals", that is, they are composed of 100% of one element. Each element is located on an arbitrary vertex. The location doesn't matter, as there are only two possible ways to locate them, and the two ways are a mirror image of each other.
Spirit or Aethyr is a special case. It is located in the center of the tetrahedron, in the hyperspace core.
©2001 Winchell Chung Jr