Herblaw is used to make different sorts of potions and poisons. Before you can use herblaw you will need to complete the druidic ritual quest.

A lot of the herbs you find in the game will be unidentified. To be able to use them you will first need to use your herblaw skill to identify them. Just click on a herb to identify it and if you are high enough level it will then become an identified herb type. As your herblaw level gets higher you will be able to identify more and more different herbs.

You will need a vial. These can be bought from the herblaw shop in Taverley. Fill the vial with water from a sink or fountain. To make potions you will need a combination of one identified herb and one other ingredient as shown in the table below. You must add your herb to your vial of water first and then the other ingredient. As you reach higher levels you will be able to make more types of potions.