Barkskin hardens the target creature's skin, granting a natural armor bonus of +3 to Armor Class, +1 per 6 caster levels, +1 per focus (regular, greater, epic, legendary, paragon) in Transmutation, reaching +18 at caster level 60 with paragon spell focus in Transmutation. When cast by a Ranger, the AC bonus is 2 lower than normal.
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