Also known as "dreamleaf" or "tranq", this dried herb, when smoked or ingested, induces a state of relaxation and altered perception.

When smoked or ingested, the user gains temporary advantage on Wisdom skill checks and Wisdom saving throws. They also are resistant to psychic damage. Both of these effects last for 1d4 hours. However, they must make a DC 15 Constitution saving throw (with advantage if the PC is addicted) or else experience a "bad high," rolling on the table below for negative effects.

Bad High Effects Table (d8):
1. Paranoia: The user becomes extremely paranoid, suffering disadvantage on all Charisma checks involving interactions with unfamiliar individuals for 1d4 hours.
2. The Munchies: The user experiences intense hunger, causing them to consume 1d4 servings of the party's rations or, if in a settlement, order a number of food servings equal to their proficiency modifier in gold pieces.
3. Fatigue: The user feels overwhelmingly tired, suffering a -2 penalty to Strength and Dexterity ability checks and saving throws for 1d4 hours.
4. Shortened Attention Span: The user finds it difficult to focus, suffering disadvantage on all Intelligence checks and saving throws for 1d4 hours. Additionally, they have disadvantage on concentration checks for spells.
5. Coughing Fit: The user experiences a severe coughing fit, making them easier to detect. They suffer disadvantage on Stealth and Sleight of Hand checks and cannot take the Dash action for 1d4+2 rounds.
6. Vertigo: The user feels dizzy and disoriented, suffering disadvantage on all Dexterity checks and saving throws for 1d4 hours.
7. Sluggish Movement: The user's movement speed is halved for 1d4 hours.
8. Hallucinations: The user begins to see and hear things that aren't there, suffering disadvantage on all Wisdom skill checks for 1d4 hours. This overrides the advantage on all Wisdom skill checks that the herb initially grants.

Side Effects:

Addiction Risk - Prolonged and repeated use may lead to addiction, requiring the user to consume the Leaf of Serenity regularly to avoid withdrawal symptoms.

 Social Stigma & Legality - The Leaf of Serenity was initially favored by the more nature-oriented classes and races. However, its popularity among these groups led to scorn from the nobility and upper classes in human dominated settlements. This disdain fueled the spread of harmful stereotypes against its users, eventually resulting in its stigmatization and prohibition.

Notes: An Eighth of The Herb of Tranquility typically costs around 20 gp and contains 7 servings. Large creatures must consume two servings to feel the effects.