Fanged Skeletons are dual weapon warriors, always fighting with two daggers. They are probably the weakest skeleton type, their skills limited to Dual Striking. They don't even have Dual-Weapon Expert, as their attacks NEVER inflict bleeding damage associated with it. The only thing to keep in mind when fighting them is their skeletal immunity to flanking,Nature and Cold damage. This is offset by them being vulnerable to Fire.
See: Dragon Age: Origins