A magical device that allows a vessel to travel through Wildspace and the Astral Sea.
Helms come in many forms and with varying properties, but nearly all are ancient and rare. In this setting, the most common helms are arcane in nature, requiring attunement by a spellcaster/helmsperson and drawing energy from a crystalline fuel called arcanite. A typical vessel able to store up a month's worth of fuel between stops.