Bright Yellow Runechalk

Chalk One Up. As an action you can use this chalk to draw a simple symbol. A creature using this chalk must have at least an intelligence of 6 to draw these symbols. You can draw up to 20 symbols with this chalk before it is completely used up.   Square. Fills a container with 1 pint of your favorite ale.   Circle. Casts the Light cantrip on the object that it is drawn on.   Triangle. Fills a container with 1 pint of lamp oil.   Cross. Casts the spell Grease when a creature crosses the symbol. Lasts for 8 hours maximum, the DC for this spell is 12, A maximum of 3 cross symbols can be active at any given time.