The World Gate or Gate of Another World is a special gate/portal that helps people that were summoned to random alternative worlds to return back to their own world. Gates of Another World can be found in random or dangerous places that exist in alternative worlds. One such World Gate is in Alayzard.
A Gate of Another World usually has a stone-like form with a portal of lighting coming right out of its center.
How Gates of Another World formed is currently unknown, however it is known that the World Gate can't be normally used by the people the World Gate is from, but used by the people who were summoned there.