Origin
Sally Barstow was a cunning witch who pretended to be a comely maid so that she could be hired by an army commander’s family to aid them on their trip to colonize Florida. She used magic taught to her by her mother to enchant her employer to cheat on his wife and impregnate her. After bragging about it to her employer’s wife, the wife accused her of witchcraft (not realizing how correct she was). Pious members of the garrison chased her out to the swamp and killed her. As she bled into the swamp, her magic infected everything living in it, including her unborn daughter, which mutated into a personification of her own vengeance.
Creation
The Swamp Witch first appears in Incredible Hulk (2023) #4 by Phillip Kennedy Johnson and Travel Foreman.