D&Dtools

This spell modifies the functioning of all conjuration (teleportation) spells and spell-like abilities, including dimension door, greater teleport, refuge, teleport, teleportation circle, and word of recall, into, out of, and within its area of effect.

If the spell is cast in an area adjoining or overlapping another teleport cage, the effects of both spells merge to create a single teleport cage. Undermountain, the greatest dungeon of Faerûn, is believed to have been enclosed within the largest teleport cage in existence in the Realms by means of this combinatorical effect.

When this spell ist cast within a teleport cage, such translocation spell simply transport all affected creatures and objects to another random location within the teleport cage. For example, if a wizard casts teleport within the confines of Undermountain, the encompassing teleport cage would cause him to appear at another random location within the great dungeon.

When a caster outside the area encompassed by teleport cage attempts to teleport into it, this spell redirects his destination to another random location reachable by the spell. For example, if a 9th-level wizard in the city above attempted to teleport into the depths of Undermountain, the encompassing teleport cage would cause him to appear at another random location within 900 miles of the place where he cast the spell.

Material Component: Diamond dust worth 1,000 gp.