The Shadowvortex

The shadow vortex is the largest anchor point with the shadowfell. The size of this reality bending place is so incredibly large that laws of physics are being bent.
It is shaped as a large storming vortex with waves of energy surging through it.Ancient ruins from both the physical plane and the shadowfell fly trough the storm. The closer you get to the center the more slow and silent things become. In the center lies a castle that acts as the acher point. It is also one of the old heros temples.