The Ark of Time is a very old artefact of the world, presumably it was created by Gade as he can manipulate where and when it appears. The Ark can transport people from one place to another as it was done so by Raven and Kat to bring back The Lost Tribe. Inside the Ark are the non-physical manifestations of Light and Dark. When released upon the explosion of the Ark, Raven travels to Illumina with Gade and Cyanea to claim them back. While doing so they manifest into their Physical forms, Lumino and Tenebria.