-25% to Target Defense

A special attribute, the only place you can get this are Eth runes when placed in a weapon. (You can also get this from the barbarian's Battle Cry, Taunt, and paladin's Conviction aura, but because this guide is centered on bowazons, we'll just stick to Eth runes.) With an Eth rune in your weapon, your target's effective defense rating is reduced by 25% per rune; this defense reduction is static: it does not slowly chip away at a monster's defense. Note that this defense reduction applies only to the attacker, so if a bowazon with two Eth runes in her weapon and a hireling with one Eth rune in his weapon are attacking a monster with 2,000 DR, the bowazon will be attacking the monster as though it had 1,000 DR (a 50% reduction) but the hireling would be hitting it as though the monster had 1,500 DR (a 25% reduction).

This bonus to hit is not listed on the character screen. Note that Eth runes operate at half-effectiveness (-12.5% defense) when used against other players, champions, uniques, or super uniques.