Quercus is an old ent that hosts information for the Wilderness WarbandsDistraction & Diversion. He can inform players of nearby warband camps in the wilderness that are setting up, and requests players to intercept them to keep the balance. He will exchange any camp supplies looted from the warband tents for either an experience reward or coins. He is located on the Wilderness Wall between Edgeville and the Grand Exchange.
Like all ents, Quercus is a Guthixian that was brought by Guthix to Gielinor in the First Age to tend the trees using the power of the Anima Mundi. As of Guthix's death, it is likely that Quercus is attempting to protect the world from another God Wars by gathering adventurers to eradicate the bandit warbands.
Quercus is the Latin word for "oak", and also the name of the genus to which oaks belong.
When spoken to with a giant ent summoned, the ent will tell Quercus a tree-related joke.
Occasionally, a bird will land on his hand, after which he puts it into the nest on his shoulder.
Using a hatchet on Quercus causes him to ask "Is this some sort of threat?"