Avantoe is a mid-level herb, requiring a Herblore level of 48 to clean from the grimy version. It can be obtained as a monster drop or through the Farming skill, with a level of 50, by planting an avantoe seed in a herb patch. It is used to make fishing potions, super energy potions, and hunter potions. To create a potion, you need to add the cleaned herb to a vial of water to create an avantoe potion (unf), and then add the secondary ingredient.
According to the book Gielinor's flora - herbs, the name means "moment", likely due to its unusual lifecycle caused by the harsh climate of the Kharidian Desert. Avantoe sprouts only after rain and then dies shortly in a matter of days.