Fissure

A fissure is a crack on a wall that appears in 'a link between worlds'. It is used to travel between the two worlds, Hyrule and Lorule. Fissures start appearing all over Hyrule after the first transportation into Lorule through a fisure present in Hyrule castle. They can only be accessed as a painting, so Ravio's bracelet is necessary. These fissures are said to occur because Yuga started bringing Lorule and Hyrule closer by travelling between them. Their appearance is a thin slice in a wall surrounded by what appears to be a blotch of paint which is mostly black in color. In Hyrule, the fissure emits darkness, whereas in Lorule, it emits light.