A Cenarion beacon allows a seasoned herbalist to spot insidious fel creep - a malfeasant product of Felwood's corruption. My work here has taught me the knowledge of purifying fel creep into a cleansing reagent... used in what we now refer to as Cenarion plant salve.$B$BWhen you gather herbs in Felwood, you should encounter the fel creep so long as you have the beacon. In exchange for what you bring to me, I will give you pre-made Cenarion plant salve.