Despite powering a lot, the boss still didn't end up winning against Elaina. It didn't even have the chance to fight back. Elaina stares at the bull monster who is bleeding and breathing it's final breath.
"Time to end this," Elaina readies her sword and stabs the heart of the bull monster, killing it and ending its miserable life. A few seconds later, its giant body slowly disintegrated, leaving behind a few items like its bull horn, the weapon it used, and a few items that Elaina recognized as accessories that the bull used on its body.
But because she was not interested in them, she immediately put every single item inside the bag and planned to sell them later on. Those things are useless for her and they are not part of the quests given by the gods. At least they can benefit other people than hoarding it themselves and not using it in the process.