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Tabitha is a first generation nightkin Mariposa super mutant who served in The Master's army along with Lily Bowen. When the Vault Dweller destroyed The Master and his army disbanded, she probably wandered aimlessly for years, at a certain point stumbling upon an old Mister Handy named Rhonda, with whom she fell in love.
At some point she joined Marcus, who founded the settlement on Black Mountain in 2278. In the same year, Tabitha rallied all second generation mutants against Marcus, forcing him to leave, and established herself as the tyrannical ruler of the newly formed State of Utobitha.