Major Gate Ward (Reversible)

This spell is a more powerful version of gate ward. It has a longer duration, but more important, it can affect any gate or portal. Thus, a gate between any layers or planes can be blocked temporarily. If the spell is cast just as a creature enters a gate, the creature vanishes into the gate and immediately reappears out of it on the same side. It is important to remember that in Sigil, the Lady of Pain's will over portals is absolute. No portal can be warded against her wishes.

The material component of the spell is a bar of silver (worth at least 50 gp) engraved with the wizard's seal and bent into a circle.

Break Major Gate Ward

The reverse of this spell, break major gate ward, automatically dispels a major gate ward cast by any wizard. The material component for this spell is a silver spike (worth at least 50 gp).

Special Note

As a special note, it's worth pointing out that while this spell can affect the portals of the Great Road, the gate-towns, Mount Olympus, and Yggdrasil, such seals probably aren't worth the mage's time and effort. It's virtually assured that the rulers of the gate-towns retain mages who can break major gate ward, and the portals of the Great Road are too widely used to remain shut for very long. As for Mount Olympus and Yggdrasil, those planar pathways were created by the Greek and Norse powers, respectively, and no sane wizard wants to tempt their wrath by closing off the gods' portals.