The Calm Mint is a consumable that grows around a spring in the Oasis Tower. While eating it doesn't have very many effects for the champion.
Calm Mint Eating the sprig of raw mint is a bit of a stretch, but you manage to gulp it down. As the strong minty flavor overwhelms your taste buds, your mind feels calmer, and a relaxed sensation spreads through your body.
You take a good look at Minerva’s “garden”. Fruit trees surround the spring, each bearing what appears to be a fruit. There are many strange herbs growing around the spring, fed by whatever power resides in the water. Finally, you locate a sprig of something that resembles mint, but silver in color, and decide to pluck it.
The object is needed for the Minerva purification quest, which along with Pure Peach and Pure Honey create a mixture to get rid of the corrupt parasite from her.
Consumables are a specific set of items which, upon use, are consumed and removed from the inventory. Some have the ability to transform the champion's body. Others raise/lower stats, grant special abilities, and more.