Teleportation circle

Teleportation circle was a conjuration spell that created a circle that teleported any creature inside to a designated spot.

Effects
Upon casting the spell, the teleportation circle appeared on the floor or other horizontal surface. It functioned like the teleport without error spell. Any creature who stood within the circle was teleported to a designated spot. This designated spot could only be set once. The spell failed if the caster attempted to set the circle to teleport creatures into a solid object, to a place with which they were not familiar and had no clear description, or to another plane.

The circle itself was subtle and nearly impossible to notice. The caster needed to mark the circle in some way to keep creatures from activating it accidentally.

Teleportation circles were extremely difficult to detect and disarm.

The pre-Spellplague version of the spell lasted for an amount of time that depended on the caster's power, usually several minutes. After the Second Sundering, the version of this spell most commonly seen lasted for only a few seconds. Both could be made permanent: the more powerful version via a permanency spell, and the weaker version by being cast every day on the same spot for one year.

Components
This spell required verbal and material components. Before the Spellplague, amber dust was required to cover the area of the circle. The post-Second Sundering version of the spell required that the circle be marked with rare forms of chalk and ink infused with gems.