Effect: This potent and feared ability allows the weapon to sever the limbs of those it strikes. On an attack roll of 20 which is confirmed as a critical hit, the weapon severs an opponent's limb from its body. Some creatures, including many aberrations and all oozes, have no limbs. Others, such as golems and undead creatures, are not affected by the loss of their limbs. Most other creatures, however, have their movement slowed 75% and attacks slowed by 50% when a limb is cut off.
Note: Red and Purple named bosses are immune to this effect.