This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Bak (Indian)
Baak, Bak or is a creature that frequently appears in folktales in Assam. The baak is believed to live near water bodies and is usually malevolent in nature, troubling fishermen among others. The baak is fond of fish. Unlike many other creatures which are limited to parts of the state, the baak finds space in folklore across Assam. It can change shape and times enters a human corpse and draws energy from it.
The baak is usually believed to be malevolent in nature. It lives near water bodies and enjoys fish. Baak can be murderous, drowning its victim to death. It often assumes the form of its victim after death or possesses the victim. It then goes on to live with the victim's family, attempting to kill them too. Carrying a torn fishing net can help avoid baaks, as they are said to be afraid of it.