The Deadly type allows players to create blocks that completely kill another player upon contact. You can program the Deadly to move, emerge, or flip. Even if you are the editor of the Deadly, it will still kill you on contact. Deadlies also have the "not auto filled" attribute, so if you don't want the Deadly to fill with a back, then select that attribute. If you would like more information about Deadlies, then visit the Support Page.