Conceal Magic

Regular 
Cast on a single person or item, this spell interferes with any informational spell cast on the subject. Twice the energy put into the spell (up to 5 points) is subtracted from any skill roll made to learn about the item, find it, etc.

Example: 4 points of energy are put into a Conceal Magic spell on a ring. Until the spell expires, any Detect Magic spell will be at -8 to work on that ring; Identify Magic will be at -8 to find any spells on the ring; Mage Sight will not see the ring unless the mage made his roll by at least 8 (though he may still see other things) – and so on. 
Note that this spell has similar effects in some ways to Scryguard, but they’re not the same!

Duration: 10 hours. 
Cost: 1 through 5 to cast. Same cost to maintain. 
Time to cast: 3 seconds. 
Prerequisites: Magery 1 and Detect Magic.

Item 
This spell may be cast permanently on any item to make it harder to sense or identify with magic.  
Energy cost to cast: 100 times the cost above – e.g., 200 to give a -4 on all attempts to detect or identify.