So as the myth said, the original world has already been destroyed! The world they are living in rn, is fragments of the Original Dimension. There are several other dimensions that also contains fragments of the Original Dimension.

The original God is a human with special godlike powers that allows them control over dimension, after his OG Dimension was destroyed, he used his power to recreate it as best as he can, unfortunately, this takes too much toll on human body for obvious reason, so he need a successor. As his power weaken, the worlds he makes also starts falling apart.

The gap between cycle varies, it can be anywhere from 500 years to 5000 years if they are lucky. There are always multiple successor candidates, but only one can be the next ‘God’. The God will spend the rest of their (prolonged by the sheer amount of magic they receive from the old god) life maintaining the dimension after they remake it again. The mark of successor candidates are their eyes’ colour and the mark inside it.

The ‘God’ that appears at the start of the story is a proxy, the real body of the god live in a temple located in the remains of the OG Dimension. You can only kill ‘God’ by killing the real body. The ‘God’ powers may include: Dimension Travelling, Body Split, World Creation and Destruction, and various stuff.

Thyris can also travel through the rift as long she stabilizes the opening first by using memory crystals scattered across multiple dimensions.

What is Memory Crystal? Basically it’s magic crystal that contains ‘memory’ of a scene, including people, location, and everything they witnessed at the time their magic were 1^st triggered. You can interact with the ‘memory’ it shows, but you cannot change the events in it.