Damage reduction

Damage Reduction: This represents a creatureâ€™s ability to ignore a certain amount of melee damage (bludgeoning, slashing, or piercing) from a single hit unless the weapon inflicting the wound has an Enhancement bonus equal to or greater than the damage reduction. Damage reduction is listed along with the amount of damage ignored and the power of the weapon needed to penetrate the effect. Thus a creature with 20/+3 damage reduction ignores the first 20 points of damage from any weapon that does not have an enhancement bonus of +3 or greater. Non-melee damages such as from elemental or magical attacks ignore damage reduction.

There is another type on damage reduction, and that is 20/-. The '-' means if a single hit from any enchancement weapon (0-20) does 50 damage, 20 damage is ignored.

Damage Reduction is apart of Barbarian and Dwarven Defender classes. There some feats and spells that give damage Reduction. Plus some Druid and Shifter give this effect too.

BoW Changes
There are no items in BoW that give damage reduction, adn some forms have to been change to have not damage reduction.