Light Ward

Component Cost: 25 gp or 1 healing surge
Market Price: 125 gp
Key Skill: Arcana or Religion (no check)
Level: 3
Category: Warding
Time: 1 minute
Duration: 10 minutes

You ward an area, up to 4 squares by 4 squares, shrouding it in darkness. This darkness blocks line of sight for all creatures. Any creature fully within the darkness is blinded until it leaves the darkness. A light source within the warded area is not extinguished but sheds no light. You can end this ritual’s effect as a minor action.
    Ritual Scroll: You can perform this ritual as a standard action when you do so from a ritual scroll. If you do, the warded area dampens light but has no effect on creatures. While in the warded area, bright light becomes dim light, and dim light becomes darkness.

Published in Dragon Magazine 405.