Consumable magic items--potions and scrolls--are common in all cultures; they can be created using "standard" magical techniques. It is through the manipulation of ether, the otherworldly matter of the Ethereal Plane, that permanence and even sentience can be applied to magical items. However, the ability to conjure, contain, and use ether requires exceptional degrees of arcane skill and understanding.
Ether is a stand-in for the Protoculture of the Robotech Universe.