Dreamroot Bark

Out of the corner of your eye, you notice a large cylindrical container with a faint light emerging from it. You take a look inside - thick ribbons of a pink bark fill the container, softly glowing.
Hey, what's this?

Ooh, good find. That's my dreamroot bark. One of the most potent magical plant materials around. It's a seriously valuable material for potion brewers. Just a sliver goes a loooong way. They also taste nice to snack on, too.

You snack on potion ingredients? That's so strange.

All the time! A lot of ingredients are edible. That is what makes the potions edible, too. Add in too many inedible materials and the potion won't have an effect. Dreamroot bark tastes of a soft candy, and it's chewable like one too. Here, try!

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You tear off a small chunk of the bark as the owner hands it to you. The more you chew, the more tired you feel. Each bite and you feel your eyelids sink further, as your body grows weak. Soon enough, your vision completely disappears.

You hear a snap and your eyes flicker open. You look up and see the shopkeeper holding you in his arms. He has a slightly worried look, morphing into a giggle.

...Whoops! Forgot to mention, chewing on it sends you to sleep and gives you wonderful dreams. We set up a dreamcatching spell before eating the bark, then use those dreams in manifestation spells.
He looked visibly worried, trying to hide it with a laugh.

You could've warned me!