Nisorin, you want biowarfare? You've got it. Here's some neurotoxins for you.

This isn't really metagaming, because I've thought of these ideas, so yeah.
Paralyzing VirusThis virus infects the nervous system, and destroys it, paralyzing the host. It also absorbs any electrical signals from the brain to any part of the body, which would paralyze the person before the nervous system has been destroyed. The virus would use the electrical signals to grow stronger. Involuntary systems won't function, either, as the entire nervous system would have been destroyed. The person would eventually die.
Seizure VirusThis virus infects the brain and causes brain cell damage. It would result in seizures, and the mind being broken down. The seizures would then cause brain cell damage, which would result in more seizures. It's a vicious circle. An endless loop between seizures and brain cell damage, until the person dies.
Disorientation VirusThis virus would also infect the brain. It would mess up the orientation of the host. The person would lose their five main senses, as well as secondary senses, such as the sense of time, direction, etc. The infected person would be so fucked up, that if he or she tried to attack, it would be certain that the person would harm itself more than his or her enemies. At the same time, however, the virus would make the infected person think that nothing unusual is happening, so the infected would actually try to attack the enemy, but would certainly harm themselves. In the end, they're so fucked up that they wouldn't know that they're fucked up. The brain wouldn't even know how to function at all, resulting in no brain activity, which is the real life requirement for official death.
Spasm VirusThis also infects the brain. What it does is infect the brain cells, and force them to fire continuously until they swell and die. This would result in uncontrollable movement and actions, for example, gnawing obsessively on a rock, or move their heads around in figure eights. At the same time, however, the memory of the person would be killed off, as it would overstimulate the neurons that retain memory. The virus mimics as a neurotransmitter. It would quite literally fry their brains.
Cannibalism VirusThis virus infects the brain and causes them to crave on living flesh and organs of their own race. They would stop what they are doing and become really, really hungry, like it didn't eat in a week, and would then try to eat its own race, literally down to the bone. Basically, it induces cannibalism.... Zombies, anyone?
Self-destruction VirusThis virus infects the brain and the nervous system. It would force the brain and the nervous system to send out signals to the body to disrupt itself. For example, promote irregular heartbeats and cause heart attacks. It would even tell the body to stop reproducing cells. As there wouldn't be any new blood cells replacing the old ones, nutrients for the body wouldn't get around fast enough. The immune system would break down. Bones would crack and shatter. The whole body would break down. The brain would even cause signals to force the organs to break apart, until the person is dead, and would still keep going, until there is nothing else to break down. It would force the brain to send signals through the body. When there is nothing else to break down, it would break down the brain.
Note: All these viruses are AM and ASE properties. Due to Conventional Aralang ethics, they will only use the Paralyzation and the Disorientation Viruses.