Smite of Ancient Knowledge

When you hit with a melee weapon attack against a fiend or undead creature with 50 Hit Point or less, you are instantly granted a free first level Divine smite (that does not consume a spell slot). If you divine smite, Bearclaw's blade turns a laser-like green. If the damage from the smite would reduce the creature to 0 Hit Points they are killed (unable to make death saves if applicable), and the wicked essence of their eternally damned soul is extinguished permanently. The creature can be restored to life only by means of a wish spell to reverse the effects of this curse.