The Wyrdgate is a "black area" cut through the Wyrd, the foundation of Erilea and all worlds in the megaverse. It is capable of opening portals into different worlds, or destroying them altogether. The Wyrdgates open randomly, or with the use of the Wyrdkeys.
Inter-dimensional creatures, like Gods, can enter and leave through these gates. It is also possible to make Wyrdgates, like when Queen Maeve created a Wyrdgate just so she could escape her husband Orcus from their original Valg world.