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This +3 frost greatsword sheds light as a torch when the temperature drops below 0°F. At such times it cannot be concealed when drawn, nor can its light be shut off. Its wielder is protected from fire; the sword absorbs the first 10 points of fire damage each round that the wielder would otherwise take.
A frost brand extinguishes all nonmagical fires in its area. As a standard action, it can also dispel lasting fire spells, but not instantaneous effects, though you must succeed on a dispel check (1d20 +14) against each spell to dispel it. The DC to dispel such spells is 11 + the caster level of the fire spell.