Leshen can be found in ancient forests of Velen.
They are weak against Igni, Relict Oil and Dimertium Bomb.
Leshens dwell in dense, primeval woods. Fiercely territorial creatures, they hunt with stealth and cunning as their only companions. They use their inborn magic to control the plants and animals within their territory — and so when stalking them, half the battle is merely getting near enough to strike. Leshens old enough to earn the appellation "ancient" wield advanced skills and tactics that make them particularly dangerous.
Found in forests, leshens can be deadly enemies if underestimated. Act with caution, however, and they're easy enough to see through. Their most prominent attack comes in the form of gnarled roots and tree branches bursting from the ground. If the summoned roots hit you, they'll break your guard or send you flying.
Fortunately, these roots can be dodged with a roll, as they manifest in a straight line. When under attack, leshens have a habit of disappearing in a cloud of black smoke. When they're out of danger, they'll usually reappear nearby, and, if feasible, will attempt to swing a claw at you.
They're relatively stationary foes, though, so thoughtful movement is key here. However, this tactic can prove ineffective if the leshen summons its forest friends - namely a small pack of wolves. When a leshen roars, it won't be long before the beasts show up, so be prepared to counteract numbers with signs like igni or aard. Whatever you do, though, don't let the wolves distract you too much from the leshen itself, as you'll still need to be on the lookout for its deadly summoned roots.