Seven factions, two wars, one battlefield. Devastation is IMMINENT...
Once you've built a Science Complex, you have the choice to pick one of two researchable techs: Corruptive weapons or Biological weapons.
Shown here are two new units obtained from Biological weapons research: the Infector and the Defiler, both of which replaces the Desolator and Hades Tank.
The Infector is extremely deadly against infantry as it is armed with a mutator cannon. It can easily mutate infantry into Small Brutes but not instantly (unless elite). The cannon is pretty slow to fire and it is not effective against buildings. It does inflict decent damage against tanks and aircraft.
The Defiler is what it says on the tin: it defiles the environment around it with deadly toxins. It is armed with a sweep laser which spreads toxins as it goes. Using this on moving targets can leave a trail of toxins. It also has the ability to contaminate an area around it. It constantly dumps large amounts of toxins around itself, poisoning the area and making that very spot impassable. Leakages do happen and this damages the Defiler a bit though. If destroyed, the Defiler will blow up and release it's toxic chemicals and toxic gas.
credit: zenoniations (Defiler, modified by me)
It looks sexy :)