The Principle of Materials

Each material has a set of properties that will govern its usefulness in a given context. There are specific situations and uses for a material. One who knows how to will use silver and gold appropriately and glean the maximum benefit from their use. Others will just use them to make pretty, albeit useless, patterns. I have found a perfect magical ward that keeps physical beings away: It's called a Brick Wall. It's fairly simple to make and it keeps all but the most determined or miniscule physical creatures out of your circle.