Virii

The worm-like Virii is the initial form of the viral infection.

Upon entering Darwinia, the Virus immediately began adapting to the environment. This is how it took on its first form, that of a two-dimensional, predatory worm. Within Darwinia, they appear as a string of triangles.

Strengths and Weaknesses

 * Virii are most commonly found in swams and are very easy to pick off. The Squad even at 3 members can easily deal with a swarm of these without trouble, so long as the player doesn't get too close.
 * If the player invests in Darwinians themselves to the point they get lasers, this virus becomes no threat at all to Darwinians themselves and its best to take this program to at least V.3 for this reason.
 * They will chase after Engineers who try to flee from them, and are capable of crossing the seas around Darwinia without being harmed. They are the only form of the virus which pursues its prey over long distances. So long as the engineer doesn't stop, they will never catch up.  This means they can follow the engineer back to a unguard incubator and do a bit of damage.  The Virii are therefore most dangerous to these units above all others.
 * Spore Generators produce these if one of their eggs lands on top of a soul.
 * Triffids eggs will often create a small swarm of these.
 * Late game these are no threat at all since the player will either have enough explosive power or Darwinians armed with lasers.
 * Virii are often placed around various important locations like incubators, and despite how weak the Engineer is, it is possible to send 5 engineers and unlock use of a building. The Virii tend to go for the first target in range and ignore other Engineers, allow a small time frame for the other engineers to start to unlock the structure.  If the player fails; simply repeat, progress on a building does not reset so as long as they manage to start unlocking the player can unlock the building indefinitely.  This is known to break several maps including the Yard where it is possible to approach the maps only two incubators from behind the mountain and unlock them, making the location a lot easier to beat.

Trivia

 * They are based on a Computer worm, a low-level computer virus whose soul purpose is to replicate itself onto other computers and spread across the internet by exploiting security weaknesses. They are usually low level threats and although do damage like take up bandwidth, they do not do high levels of destruction, allowing the worm to continue to spread and possibly remain low-key avoiding detection.