Define the Canvas

You produce rune-inscribed stones, which whirl in the air before darting away to form a perimeter for a runic canvas. The canvas is a 20-foot burst on the ground centered on a corner in your space. As long as you're in or adjacent to the canvas, you can Trace a Rune directly into the ground, which causes the rune to expand across the entire space, tracing it onto any number of eligible targets within the area. The canvas lasts for 1 minute.