Easy Warrior Weapon Skillups

Thanks to www.hiddenstuff.com for the info!

The trick is, find an undead skeleton-type or ghost-type that's immune to Rend. Charge them, and continuously rend. It will be immune, but it will still count as a swing, you will still level up the skill, but you will keep your rage because the mob is immune. Therefore allowing you to do it an infinite number of times, until your weapon skill is max.