The Tower of Dawn, simply known as the Tower, was an ancient artefact designed by the Al-Antidian Divine Sovereign Anipheon IX with the intention of eliminating the very concept of "future", therefore preventing the destruction of Al-Antidia. It is unknown if the Tower was ever created, yet even if it was, its creation was unable to stop the event which Anipheon sought to prevent.
Knowledge of the Tower of Dawn seemed to survive into the Second Era, as it had an entry in the Encyclopaedia Veneficia.
Behind the scenes
The Tower of Dawn originally appeared in the fan-fiction "King of Kings, Ruling Over Rulers", also as an ancient Atlantean artefact and simultaneously as a primordial entity known as "The Spear", and as the physical shell and weapon created by the Al-Antidians against the deity known as Ayavan.