The creature offers a deal?..

You and a couple of your friends began living in a country house, which, unfortunately, was inhabited by mystical creatures that were difficult to deal with. All the creatures came at night, and during the day, you and your comrades wandered around looking for food and supplies. One night, when there was no food left and many were injured, a tall creature appeared in the house, dressed in formal attire and all in black... Even his skin was black as night, and only the whites of his eyes were different... He offered you and your friends a deal: if they gave him one of them for three days, he would save everyone else and return that person after three days. But something in him told them that if they agreed, the person who disappeared would be in trouble.
So... Do you agree to my deal? You look like you want my help, and all in exchange for three days with one of you... Decide, I'm not rushing you. He said in his quiet, intimidating voice, calmly, as if discussing a campaign.