Phosgene was a potent killing agent, deadlier than chlorine. Each sequence of levels adds additional faster, deadlier enemies. Until a vaccine was developed in 1963, measles was considered to be deadlier than smallpox. The latest creations were bred specifically to become mutant-hunting weapons much deadlier than Sentinels. Pikens are large, destructive creatures, while krauls are smaller, deadlier beasts. The Five Nations's use of modern weapons caused the wars to become deadlier. The Berserkers' bases are capable of manufacturing more and deadlier Berserkers as need arises. The season was also much deadlier and destructive than the previous season. Their venom is a complex mixture of toxins, some fast-acting and others slower but deadlier. Gentry totally redesigns his porcupine battle-suit, making it far deadlier than before. As a result, he becomes a much deadlier opponent. Soon after its inception, the Station began to develop a new, deadlier vision of al-Qaeda. In Latin America, however, hatred of Mormons has often taken on a much deadlier form. Over time, hafting evolved and tools became deadlier with more control. This story was adapted as the 1967 European spy movie "Deadlier Than the Male".