The Sword of Alexander (Abjuration/Curses, Cost, Per Scenario, Requires The Eye of the Nexus, Corrupting): Slipknots are pure imminences that suture together different locations in space-time. Nexialists use The Sword of Alexander to collapse a slipknot for a determinate period of time.
The formula can be used either defensively (to close a slipknot "behind" a ship exiting a slipknot) or offensively, to collapse the space-time suture around a vessel at the exact moment the ship enters the slipknot. The latter use causes a mishap for the ship entering the slipknot. Such a use of the formula is invariably Corrupting.
To cast The Sword of Alexander, the caster makes a WIS roll: at +2, the suture closes for one day. For each additional increment of effort past +2, use The Time Table to determine the duration of time for which the slipknot is closed.
It goes without saying that the use of this formula is frowned upon by the authorities. It can cause severe economic damage - even loss of life - to systems dependent on the slipknot network for their economic well-being. On more than one occasion, local closures have led to spontaneous pogroms against members of the Nexialist Order. The Order itself is extremely circumspect in teaching this formula to its members. Only the most faithful and trustworthy Nexialists have the opportunity to learn it.