Tiny Prison

Draw a square with a circle inside of it with your charcoal or chalk. Must be at least 5 feet by 5 feet. Place the lump of metal at the center of the circle. Draw lines from the center of the circle to the corners of the square and place the emeralds at each corner. Draw four more circles inside the big circle on each line you have drawn and place a crystal in each of these smaller circles. Chant and hum the notes on the spell scroll. Dial in your arcana and imagine the trap you are setting. After 24 hours of meditative focus, the lines begin to glow and the components are consumed leaving a only a trace of the glyph you created. Sprinkle the pixie dust around the middle of the larger circle. It will begin to glow and then disappear completely. The glyph can only be detected with magic and can be dispelled. The next creature that walks over it will shrink to the size of a mouse while maintaining their own form. There is no save. They are, for all intents and purposes, cursed. Around them the metal creates a magical box that is impervious to dispelling and polymorph. The creature must be removed from the box for the spell to be dispelled.