Magnus’s RPG empire on the portal.

After emptying one of the two mugs, I pour half of the sleeping potion into the empty mug, approach the bartender, and say: "Friend, help me out! Soon, a man in a gray cloak will come here, he looks about 22 years old, with short black hair and gray eyes. He is a special guest at this tavern - a noble servant of the empire. When he arrives, pour ale into this mug and offer it to him! There are 5 silver coins at stake, don't let me down!"
I hand him the mug with the sleeping potion.