Reanimator

You gain a +1 bonus to attack and damage rolls
made with this magic weapon.
Additionally, you have advantage on attack rolls against a creature if at least one of your allies is
within 5 feet of the creature and the ally isn't incapacitated. When you reduce a creature to 0
hit points with this weapon, roll a d6. On a 6,
you may cast the Animate Dead spell as a bonus
action. Otherwise, you regain 1d4 hit points. You
don't gain this benefit for killing constructs or
undead.