2016’s Cold-Forged Flame is the first story in Marie Brennan’s Varekai series.
Called up out of shadows, without memory or even a remembered name, the swordswoman is magically bound to carry out a quest using methods that are unclear, for a purpose that is not explained. All she knows is that she must somehow collect blood from the cauldron of the Lhian. Whoever or whatever the Lhian might be.
One final detail she learns: most of the people who try to win a prize from the Lhian never return.