There's a flower that puts you to sleep in the forbidden forest, combine it with alcohol from the tavern and give the end product to the orc in question. The flower also has a scene to view if it puts you to sleep.
There's a hidden path that unlocks those. You have to click the lights hanging from the trees on the Traveler's Path in the right order. If it's right, it'll stay on. If you mess up they all turn off and you start over.
To fill the mug, you take it to the tavern, get the key from the counter, and uncork a barrel in the back room. Then, take the mug of beer and into the forbidden forest. There's a plant you drag it onto about halfway in to add a sleeping effect, then you give it to the orc in the camp.
