Vesily the Fang Breaker, to his apprentices Kelit Silvertongue and Jared Goldenmane. After months of struggle, hunts, and increasingly inventive and desperate attempts to best the beast, it was eventually sealed at the bottom of a well in chains of gold and beneath tons of stone, though they never did determine the source of its unnatural power... or a way to kill it. A lack they came to regret decades later, when Jared's sister Princess Jasmine the Devourer managed to replicate its previously unique strain of vampirism in herself.
"Ah, so that's how this device works! Don't give me that look; I've always had servants to do this for me 'til now."