The Void

The Void is a realm that remains largely unknown. Our knowledge about this realm is very limited, but thanks to the insights of Kassadin and the Overlord, fragments of knowledge about this realm have been revealed to us. On the right, you are able to see a picture created by a madman who had claimed to see this realm for himself. The large black hole on the left of the image is said to be an entrance to the deeper levels of this realm.

The Void is an anti-magic realm that is essentially a gargantuan prison. Kassadin was thrown into the Void by his brothers and sisters, the Gods, where he remains trapped to this day. It is also now known that when a Pocket Realm is created, it is created in the Void. In the picture on the right, what appears to be a small black hole on the right is actually a pocket realm. For those who are aware of this knowledge, it's believed this is why pocket realms require a constant flow of mana to maintain. This realm is extremely deadly for any creature that may find itself here, and exists in layers, and the deeper in you go, the more lethal the void energy and creatures within the void become.

According to Kassadin, he is not alone here. Creatures such as Void Lords and Voidlings exist here, beings that Galron has encountered rarely, but always leave a memorable impact when they appear. These mindless creatures are capable of consuming endless amounts of mana, capable of conjuring non-magical black holes, and are seemingly only harmed by physical damage. Not only that, but Kassadin states there are other beings like him and the rest of the Gods--Void Deities--that reside within the deepest levels of the Void. 

More knowledge will be revealed as Galron gains more intel on this realm...