If the well of souls to put the rampart - in the well of souls is not possible to summon the revenants.
Windows 8.1 64 bit, 8 Gm RAM, Intel(R) Core(TM) I7-4500 CPU1.80 GHz 2.40
GHz GPU: AMD Radeon R7 M265, Intel(R) HD Graphics Family. Version game 1.40f9
When you click, you see rampart. The ability of the well of souls on call revenants to become unavailable.