Rule: Potions

Each potion has magical effects that occur when imbibed, poured out, or thrown.
These effects last for a specified amount of time, which is noted in a potion’s description. To know how to make them, look at the Crafting disciplines (Alchemy). Potions also come in 3 different rarities.
A potion’s rarity is determined by the rarity of the ingredients used to brew it.

Common: Common potions are familiar enough to be used by many people that have interest in potion.
Uncommon: Uncommon potions are potent concoctions, and likely the upper end of power that folks would expect to encounter.
Rare: Rare potions do truly marvelous things, and most folk live their lives without ever hearing of their power.

Potions come in one of 3 categories based on their function :

Combat potions: Provide abilities or buffs that prove helpful in a fight.
Utility potions: Are generally useful both in and out of combat.
Whimsy potions: Peculiar and sometimes playful effects.

Ingredients

Each ingredient holds a set of attributes that help determine what type of potion it will craft.
These 3 attributes have a number associated with them, which varies by ingredient.

Combat
Utility
Whimsy

Look at the Crafting disciplines (Alchemy) to know how to use the Ingredient Attributes to make Potions. Ingredients cost : Common ingredients are typically found at local markets in small amount, Uncommon ingredients require a contact with a special dealer, and Rare ingredients are so scarce that finding a dealer is an accomplishment in itself.

Common: 3 golds.
Uncommon: 15 golds.
Rare: 75 golds.

You can find Ingredients by luck during an adventure, but you can also actively search for them during a Downtime (Hunting & Foraging).

Potion sickness

Using multiple potions also comes with the risk of succumbing to potion sickness, a very unpleasant affliction that comes on at a moment’s notice. Characters who decide to consume more than one potion in a day must first pass a Constitution Check or fall violently ill. In place of the special effects the potion would normally grant the character instead vomits as the strange concoction of magical elixirs swirls inside their stomach.