Black Widow is a boss fought in Chapter 5.
Black Widow is fought during Mission 9-4-4 as the boss, attacking in the same fashion as its predecessors with Anti-AP Field, Anti-MP Field, Super EM Field, and the very powerful Shinra Type-100 Cannon. It is slow like its counterparts, and thus can easily be dealt with by attacking from behind and baiting its fields, as it prefers using them over actually damaging HP.
Black Widow is fought around the underground levels of Yggdrasil.
Latrodectus is a genus of spider in the family Theridiidae, many of which are commonly known as widow spiders. Individual species vary widely in size, but in most cases the females are dark and identifiable by reddish hourglass markings on the abdomen. The spiders' venomous bite is considered particularly dangerous because of the neurotoxin latrotoxin, which causes the condition latrodectism, both named for the genus. The female black widow has unusually large venom glands and her bite is particularly harmful to humans.