Wraith Spider

Wraith Spiders are the one of three high-level Spiders encountered in the original Baldur's Gate, the other two being the Phase Spider and Sword Spider. They are one of the more interesting enemies to be found, as it's relatively weak but has some potentially deadly special abilities. They are fairly rare, only found within the depths of forests, and are distinguishable from their brethren by way of a yellow body with dark-purple legs.

Like most spiders, they are immune to Web, yet lack the gradual Poison that most spiders are known for. Instead, if this spider lands a successful hit, and its target fails a Save vs Spell, the target's Strength ability will be drained temporarily by 5 points. If the Wraith Spider lands multiple hits and lowers the targets strength ability below 1, it will instantly die, thus killing such a spider is generally a high priority. However, it is also immune to normal weapons, requiring a bit of magic to properly dispose of it.