Surelock

Surelock is a spell specifically designed to protect against unwanted plane-spanning portals. For as long as it is in effect, the spell seals all gates and portals that reach into other planes. This spell does not affect movement abilities within a single plane such as teleport, but permanent, temporary, and moving portals cannot open within the area. Spells such as gate cannot pull a creature into or out of the affected area. When cast, surelock spreads out from the caster in a 60-foot radius sphere. It is not possible to exclude portals within this area; everything is affected equally. The effects of this spell do not follow the caster after casting, and last until targeted by a dispel magic spell or other similar effect.