Sword of the Animist-1/2

While holding this weapon, you gain a +1
bonus to attack and damage rolls made with
this magic weapon. When you reduce a hostile creature to 0 hit points with this weapon, roll a d12. On a 12, you may regain
one spell slot of the lowest level expended
and this weapon gains 1d10 charges. You
don't gain this benefit for killing constructs
or undead.