Engraved Glyph

When you cast this spell, you engrave an object of your choice with an arcane glyph. When the glyph is created, you can choose one 1st - 3rd level spell that you know. That spell becomes stored in the arcane sigil. You determine what causes the spell to trigger, weather it is something simple as a hostile creature touching it to something as complex as someone solving a puzzle. Once the spell is cast, the glyph dissipates. The object this spell is cast on must not be worth more than 100 gold peices.