Flux (Thaumcraft 6)

Flux is a mechanic added by Thaumcraft 6. It is the "unclean" variant of Vis. Like Vis it occupies and diffuses across chunks. It has a higher priority than Vis, and at high levels can prevent the latter from replenishing. Flux also leads to the formation of tainted blocks. If it surpasses 75% of the chunk's maximum Vis capacity it will generate a Flux Rift.

It can be generated by emptying a Crucible and when the Infusion Altar is unstable.