The Infector threatens the enemy with the smallest, yet most terrifying attacks, the <l:6,41>bio-engineered plague<e>. Designed not to kill but instead horrify and confuse, the bio-plague produces lysergic acid within the victims' bloodstream, leading to hallucinations and therefore, unhappiness. Dropping the plague, however, is not free. Each time he launches his attack, the Civilization is charged <l:6,92>gold<e>. The Infector is a <l:6,120>stealth unit<e> (Spy type), which allows him to hide from regular armies.