Moongate

There are 4 kinds of moongates:

• Blue - Requires a buried moonstone. Will activate at the proper bi-lunar alignment to a set destination. †
• Red - Requires an Orb of the Moons. Only 2 Orbs were known to exist, but activation allowed for travel to any destination, which was determined by where the Orb was used.
• White - A rare form of moongate. It allows time travel. The Time Lord was able to create them and they were involved in the pursuit of Minax[?] in Ultima II.
• Black - This type of moongate requires electrically charged blackrock[?]. These types of moongate were favored by the final enemy of the Avatar, who was known as the Guardian[?].

† - Note: Britannia has 2 moons, Felucca[?] and Trammel[?].