What is the Font of Life choice in Stronger Than Achilles?

The Font of Life in the "Stronger Than Achilles" quest offers a choice between using its remaining blood on Coen, who hopes it will grant him a new power, or on Anca, who wants it to erase her troubled past; players can also choose to destroy it instead [1, 2, 3]. The decision affects Coen's abilities and shapes Anca's eventual fate, though reports note none of the options are without consequence [3].