Battle Standard of Shadow
This silky black flag becomes insubstantial as you raise it, a field of shadow spreading out from it to cover the battlefield.
Wondrous Item 65,000 gp
Power (Illusion, Zone) Encounter (Standard Action)
When you plant the battle standard in your space or an adjacent square, it creates a zone of shadow in a close burst 10. Within the zone, all bright light is reduced to dim light, and you and your allies gain low-light vision and a +2 power bonus to Stealth checks.
This effect lasts until the end of the encounter or until the battle standard is removed from the ground. Any character in or adjacent to a battle standard's square can remove it from the ground as a standard action.
Published in Adventurer's Vault, page(s) 179.