From Discworld MUD Wiki
"As of Thu Feb 26 2015 Wizards can try to 'seal [the] distortion' (blog post "Distorted Reality" )
Each attempt costs 300 GP. Sealing a distortion is a skillcheck on magic.spells.special, with the skillcheck increasing in difficulty the deeper into the Library you go. A critical fail on the skillcheck will pull you into L-Space. It is possible to TM magic.spells.special from sealing."
This seems to be out of date or incorrect. The cost to seal varies with difficulty and depth. With ma.spsp 319 (326 once my bottle was charged)
--Mirodar (talk) 09:59, 1 February 2021 (EST)