His plan

The more he thought of it, the more suspicious he got. Roy's calculations, although seemingly logical and acceptable, had a huge flaw in them.

The whole plan needed a strong power source to be triggered, a source that contained enormous amounts of universal powers. To Reynold's knowledge, there was no such object in this world, neither anywhere else. Even if such a thing existed in a world, it could easily start up a catastrophe by attracting a huge mass of Chaos, so such an object couldn't be created or stored.

There was only one thing that could contain such power without resulting in immediate destruction: A human's soul.

"The day is near. I must head to the fourth temple to complete the preparation."