The Tower

As much about the Tower is unknown this page is mostly speculation until more is revealed.

Description
The Tower is a mysterious place something metaphysically complex, though it is perceived as a place by someone's mind when he sees or visits it. Its existence is a secret known by a handful of people as entering it (as well as leaving it in one piece), requires a great deal of magic and will power.

Entering the Tower
So far, entering The Tower safely is limited to Shard holders, powerful mages capable of dimensional traveling, demons, Gods and (perhaps) Anti-Shard holders. In the story only King Alonon has managed to "see" the Tower and the experience appeared to change him, losing much of his drive for life. An other way of "seeing" the Tower by is being possessed by a Seed of Corruption but that is hazardous in both physical and mental level.

Inside the Tower
The Tower could possibly be an infinite ladder that crosses the Demon Realm, the material realm and the Divine Realm. That means that someone could use the Tower in order to travel between these Realms.

Fan theory
Due to the dual nature of the Tower (God/Demon Realm, Shards, Anti-Shards) It could be speculated that there is a part of the Tower where Soul Shards are destroyed if placed there.