Relics that generate revenue?

[_0AfTeRsHoCk0_]

Holy relics were always a big part of the middle ages. Priests would walk around town showing off peices of the true cross and citizens would donate money to the church. Once the main island and kingdoms are released, there should be 5 or 6 WELL HIDDEN relics around, and when kingdoms find them they can bring them to their church/temple/sancturary/treasure chest and store them there. For each Graalian day that passes by, they could generate.. let's say.. one gralat, until it is removed or stolen.