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Arcane Barrier
Warding 12

You create a tough, translucent wall that blocks a passageway or covers a doorway.

Time: 10 minutes
Duration: 4 hours
Component Cost: 1,000 gp
Market Price: 3,200 gp
Key Skill: Arcana

Arcane Barrier is a 12th-level ritual. It was introduced in the "Ritually Speaking" article by Peter Schaefer in Dragon #366, and republished in Arcane Power.[Dr366:27][AP:154]

You create a magical barrier of force that is 2 squares long and 2 squares tall. It is large enough to block a standard doorway or seal off a hallway. The obstruction is invisible from more than 10 squares away, but if viewed from closer than that, it is discernible as a translucent, shimmering, paper-thin wall. 

When you perform the ritual, you allow for certain other creatures or types of creature to pass through the barrier, ignoring its effects, in the same manner as for Arcane Lock (Player's Handbook, page 301). Your Arcana check, with a +5 bonus, sets the DC for the ward to be defeated by rituals such as Knock. The DC to break through the barrier with a Strength check is 5 higher than that.

If you spend 4 hours and four times the component cost to perform this ritual, the duration becomes permanent. A ritual caster who performs a ritual, such as Knock, to pass through a permanent Arcane Barrier can choose to bring the Arcane Barrier down temporarily (in which case it seals again after 5 minutes) or to destroy it.