Custom Blood Magic: Ritual

The caster draws sigils within a room no larger then 50' x 50'. The sigils, drawn with a combination of sulfur and crushed mirror, are related to theories on sacred geometry, and indicate misdirection through altering the flow of lay line energy in the area. The ritual remains in place for 24 hours or until ended by the caster. At the time of casting, the ritualist may choose to spend an additional mental trait.
 
This ritual only effects demonic entities or infernalists.  While the ritual is in place, any attempt to utilize any sort of powers or abilities to perform any variation of remote viewing or divination on anything or anyone protected within the specified room will fail. No such being can use powers or abilities to observe anything in the effected area.  No form of demonic or infernal-based divination will provide details of events or conversations that might occur there. If the demonic entity or infernalist happens to be inside the boundary of this ritual, it may no longer use any form of power or ability to observe anything outside the room without exiting first.
 
Should a demonic entity or infernalist become aware of this 'blind spot', it may attempt to breach the barrier. The entity may attempt a Static Mental Challenge against the number of traits the caster possessed at the time of the ritual's invocation. If the entity fails, it may not attempt to do so again for the rest of the evening. If the entity succeeds, the barrier is breached and the entity may observe the events in the room (though it cannot discover what occurred prior to its success). If the caster spent a mental trait at the time of casting, he or she will receive a mild pain behind his eyes, warning him or her that the ritual has been compromised.