The Striker

The Witch, or "Female Infected", is a Tier 2 Special Infected.

Appearance
Witches have the appearance of a female Mercenary clothed in a bloodstained-white jacket, emblazoned with the NEMEXIS logo on the side. They are also wearing an oxygen mask, with the jacket's hood and mask covering most of her face. A pair of googles are strapped to the top of her head, and her jacket is slightly open, revealing some cleavage. Because of their strange attire, it is uncertain what the Witch's profession really was before she became Infected.

Overview
Witches are quick and deadly, earning the title of the fastest (and only female) Special Infected. Witches are seemingly equipped with special NEMEXIS gear; which indicates that they may have been a pilot or medic prior to Infection. Though the equipment didn't help against the outbreak, it gives this Special Infected a high amount of protection from damage. Witches also have strange, tendril-like growths on their sides, remniscient to the Flood from the Halo series.

Also heavily based on the Witch from the Left 4 Dead series, these femme fatales have much in common. Not only do they both have a pale, female character model, they also share the same basic abilities. Witches are greatly resistant to Headshots. and there is no Sniper Rifle in the game that can OHKO the Witch. Not even the CF-variant of the L96A1 Black-Magnum, (technically the most powerful SR in the game), can kill it in less than two shots. They also have the unique ability to instantly kill players (without having to use Headshots) if they attack from behind. On the other hand, Witches can be "cr0wned," just like the ones from L4D. If a player manages to fire a shotgun directly into the face of a Witch (notably with the CF-Golden Punisher), it will be an automatic kill.

How-to-Kill
Witches have very few weaknesses, making them especially hard to kill unless they are continually shot. Other than cr0wning them, there are a few other methods to easily kill a Witch.

Trivia

 * Witches are currently the ONLY female Special Infected.