Liquid and gaseous substances on a biological level pass through several stages before becoming a liquid that corrodes steel. This allows you to grow new types of deadly soldiers destroyers: Guardian and Devourer. Evolving new chemicals allows you to breed more destructive warriors and gives a 4% increase in damage per level to Scourge, Dreadlisk, Guardian, Devourer, Usurper , Spore Colony and Sensor Spore Colony. Also, the effectiveness of Acid Spores ability is increased. With 10th level it increases the base speed of your Provider.