This page should help you out as a guide to brewing potions.
Thanks to Shanti for the info =)
How do I Brew Potions?
        
When using a Monk, Druid, or Ranger you will notice that in your "spell book" you have the option to "Brew potion."
Only Monks, Ranger, and Druids have this ability and they each brew a different potion.
        
In order to brew potions, you need to have all the necessary ingredients plus an Empty Potion Bottle. Go to your spell list and right click on the brew potion option and hit "use."
It will use up your 4 items and then in your inventory you will have a brand new potion.
What are the 4 items I need to brew potions?
        
Each class/potion requires 3 special items + an empty potion bottle.
Here is a listing of the items each Class/Potion needs:
Monks = Sapphire Potion = Coffee Beans, Rosemary, Moon Plant
Rangers = Amber Potion = Troll Ear, Soybeans, Garlic
Druids = Amethyst Potion = Star Fruit, Ginger Root, Mint Leaves
Where do I get the items necessary to brew potions?
        
Rangers, Druids, and Monks are the only classes able to see if any foragable plants are in the area.
When you "look around" on a square wit foragable items, it will say "You see some coffee beans growing here."
You can then /forage as many times as you want to acquire as many of the foragable plant that you want. The supply is inexhaustable.
        
Most of the ingredients needed for brewing potions grow in common areas and are typically found in dead ends that otherwise seem useless.
Empty Potion Bottles can be bought in Terra for a small price.
Here is a listing of all the foragable items and where you find them.
| Foragable Item |
Where it is located |
| Star Fruit |
Forbidden Garden |
| Troll Ear |
Forbidden Garden |
| Moon Plant |
Arborum Arcanium, Treetop Branch |
| Ginger Root |
Arborum Arcanium, Root Cellar |
| Rosemary |
Ruins, Dead End |
| Garlic |
Ruins, Dead End |
| Soybeans |
Moors, Eastern Dead End |
| Coffee Beans |
Mountain Peak |
| Mint Leaves |
Abandoned Outpost Garden |
What do these potions do?
Sapphire Potion = gives +1 agility and nullifies faeriefire during its effect
Amber Potion = +1 strength
Amethyst Potion = cures poison