Codex Arcana's Answer

Question: "When the magic in the world changed and the clairvoyants lost their sight, what caused it?"

Answer: There is no consensus. Compiled information will be presented. Ancient scholars within the Oswian Jungle found that the universe is cyclical. They determined that clairvoyants are able to witness the paths our previous incarnations took, and that the limit of their visions must therefore be the moment that life disappeared from the previous world. As observed by researchers in Xengus Sud, that moment arrived 10.56 years ago. It was theorized by the ancient Church of Denizen that such an event would cause great strain on the membrane between the material world and Mobius. Such strain could lead to three outcomes:

1. A drop in the ambient magic available to be pulled through mortal souls from Mobius,  limiting the amount of magic an individual would have access to at any given moment.

2. A slow destabilization, or "Ripple," within the barrier, possibly leading to,

3. A sudden collapse for an unknown length of time and at unknown locations while the two streams re-establish themselves.