Metallurgy, the next step in the development of metal working, delivers a new level of sophistication to Renaissance weaponry and prepares its entrance into the Modern age. It also unlocks a variety of new units. Lancers are a harder-hitting version of Knights. They have several more points of Combat Strength and receive a bonus against mounted units. However, they have a penalty during defense, making them brittle if they aren't defended. Hakkapeliitta are unique Swedish Lancers that can interact with Great Generals and have a 15% combat bonus.