This idea can be useful in a number of ways. It provides good flavor and is effective in making important NPC's more noticeable. PCs with the appropriate skills will be able to glean more information from the heraldry. Proud PCs can be divested of extra loot as they decorate their gear. I like the specific examples given. They create a sense of real places and people. Not all of these need be serious, of course. I am reminded of inscriptions found on ancient sling stones: "Take this," "Ouch," "Catch!" or "For Pompey's backside" (from http://en.wikipedia.org/wiki/Sling_(weapon)#Ammunition)
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Items (Tools) (Magical)
1. More than one person can receive the skills at any given time, letting a tyrant build an army of crack soldiers out of peasants.
2. The knowledge leaves the shrine once taken up by the recipient. In order for the shrine to be used again, the knowledge must be willfully transferred back through a nonmagical ritual. Go to Comment