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Sister Tacita was a sister from a mission of the Order of the Sacred Rose, as unflappable as St Arabella. After collaboration with numerous members of the Missonarus Galaxia in the Kaurava war, she was seconded to The Missionary aboard the Black Pearl, where she was reunited with Sister Annunciata, her classmate from the Schola Progenium orbiting Jersey II. There, the two Adepta Sororitas came to the attention of Inquisitor Mashtishaddu, one of Captain Sparrow’s passengers, who took them into his retinue.
The Missionary was persuaded by Inquisitor Harrow to sell out the Radicals, and Tacita was captured. The prisoner was deemed heretical yet faithful enough to be controlled by a pacifier helm, so Harrow had his contacts in the Ministorum subject her to arco-flagellation, with the activation word ‘Mina’ (and deactivation word ‘Arabella’), responding only to his voice. He thinks it appropriate to have her serve her penance hunting down her former master and colleagues.