Æther

Æther is a substance used in the most complex of arcane invocations. Where Archillia is powerful, æther is sublime. Few know how to find it, and even fewer know how to manipulate it properly. Although not as explosive or flashy as Archillia, its potential power can be much greater. It is only visible to people who are attuned to the magical forces of the world. If seen, it appears to be a glowing silver ball the size of a large lemon. Closer observation will reveal that it is composed of thousands of incredibly small threads of liquid metal. Attempting to physically grasp the orb will only result in pain; one must use arcane means to capture the æther. Popular containers are glass bottles, metal chests, and specially designed homunculi. Of all different Foci used in magic, æther is most useful in manipulation, observation, and control. Its applications include, but are by no means limited to, long distance scrying, creating magically binding contracts, concealing physical objects from prying eyes, or tethering extraplanar beings to corporeal objects. Advanced users can even use it to peer into the memories of those they wish, editing and adding what they wish. Æther is primarily used by spies, kings, and travelling salesmen.

-Ozymandias, Codexmaster of the Deephalls in the City of Paradox