Midnight Black 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 8 to draw these symbols. You can draw up to 20 symbols with this chalk before it is completely used up.   Square. Drawn around a lock, grants a +5 bonus to Sleight of Hand checks for attempts to unlock it.   Circle. While standing in the circle you have advantage on Perception checks you make to spot traps.   Triangle. Conjures and spreads caltrops in a 5ft. square.   Cross. Drawn on footwear, grants +3 to stealth checks for 1 hour. Effect does not stack.