Brewing will require 50 herbs for every potion. You must be MAX level in all your skills to brew. Here are all the possible potions that can be brewed

Thunder Potion: Can only be used on a Thunder Mage. The Thunder Mage will receive 1.5 times more energy

Nature Potion:Can only be used on a Nature Mage. The Nature Mage will receive 1.5 times more energy

Water Potion; Can only be used on a Water Mage. The Water Mage will receive 1.5 times more energy

Wind Potion: Can only be used on a Wind Mage. The Wind Mage will receive 1.5 times more energy

Fire Potion: Can only be used on a Fire Mage. The Fire Mage will receive 1.5 times more energy

Incense Potion: A lovely scent attracts prey. For that entire day, the Clan get +2 prey whenever they hunt

Harming Potion: A potion that can do 50 damage to any creature regardless of their defense. It is considered extremely dishonorable to use on a Clanmates and doing so could get you exiled