Black Widow Spider, common name for any of several related long-legged, smooth-bodied spiders, chiefly inhabiting the Tropics, but also common in the southern United States and found as far north as Canada. They spin irregular webs in crevices and other dark, protected spots. The fully-grown female of the familiar North American species is about 1.2 cm (about 0.5 in) long and is jet black, with an hourglass-shaped red mark on the underside of the abdomen. Males are rarely seen and are harmless. Contrary to popular belief, the female black widow spider does not kill her partner after mating. The female's venom, a neurotoxin, is poisonous to humans and her bite is characterized by local pain and swelling, nausea, and difficulty in breathing and is sometimes fatal.
This tiny, deadly spider would be of very limited use all by itself, but when combined with larger animals grants several spectacular abilities. It has a vicious toxic bite that grows very strong when combined with larger animals, and its head possesses a Loner mentality that amplifies its power immensely when it hunts alone. When this is combined with its paralyzing Web-Throwing ability, it can control fights with multiple opponents and come out on top.