Gate Travel (Underworld)

Gate Travel is a runic spell that appears in  Ultima Underworld I and II.

Spell Description
Unlike the traditional Britannian variant of the spell, which teleports the caster to one of the eight major  moongates of the realm, this runic spell transports its caster to a small moonstone associated with the enchantment itself. Once a magician possesses such a special moonstone, they may position it in locations of significance they wish to return to with ease, and invoke this spell to return to them. The workings of the spell evolved over time, actually making it more difficult to use due to the need for two instead of just one moonstone.

Trivia

 * In Ultima Underworld, this spell requires but one moonstone to function (which may be found on the second level of the Abyss). In Ultima Underworld II, it requires two: one which the mage leaves in a desired location and one which they must keep on their person in order to align the spell. These twin moonstones may be retrieved from the fifth level of the Scintillus Academy and a treasure room on the third level of the  Britannian sewers.