So as not to clog up the play thread, it is not damage resistance, like you would have for say acid or fire, but damage reduction. A certain material would bypass the damage reduction and all other forms of damage would be lessened. In this case since I have damage reduction 5/Silver only a weapon that was made of silver, coated with alchemical silver or something similar or had a magic enhancement bonus of +3 does normal damage to me. All other physical attacks ( like getting hit with a sword or mace, not getting hit with a fireball, doused in acid, shot with lightning or a spell that deals damage ect) deal 5 less damage per attack. So silver things burn but I'm resistant to other materials. Think how silver is a werewolves weakness. Same thing here more or less. For reference I will link the section on DR on the pathfinder srd.m<a class="postlink" href="http://www.d20pfsrd.com/gamemastering/special-abilities#TOC-Damage-Reduction">http://www.d20pfsrd.com/gamemastering/s ... -Reduction</a>m