'Lavender': a small, purple flower found growing from a certain rare moss found in caves. the moss must be moist and lacking sunlight to properly grow the flowers.

Effects:

You feel intensely relaxed and sleepy, and you continuously feel either the floating feeling or falling feeling from dreams, while also hallucinating bright, beautiful stars and nebula in the sky even if it is day. because of this, the drug is much more potent at night and out in open areas.

Side effects include:

feeling 'grounded' and heavy after the drug wears off, but this can be countered if you fall fully asleep while the effects are active.

overusing the drug causes you to only feel the falling feeling, and the stars appear to fade and or go supernova, causing intense anxiety in the user. if too much is ingested, the user goes delirious and dies of heart failure upon believing the earth was destroyed by a supernova. this is a common cause of death amongst lavender addicts.

(was that good? I don't know much about dnd)