Use spell as an action on your turn. When you use it you summon 1 Twig blight to assist you in your battle. It is also useful as a guard while you rest. In order to do it you must roll a d20. If you roll a 1 you fail at summoning it. If you roll a 20 you summon 2 Twig Blights. Any roll in between 1 and 20 summons 1 Twig blight.