A Leygate is a sort of portal that Sorcerers and Magicians can open at crossings of the Ley lines and use to travel large distances or to different Shadowrealms instantly in the Secret Of The Immortal Nicholas Flamel Series. The Swords of Power (Excalibur, Clarent, Joyeuse, and Durendal) can create them anywhere when all four are used together.