Umbral Weapon

You reach into the Shadowfell and pull out a weapon made of shadowstuff. Upon casting this spell, an illusory melee weapon of your choice appears in your open hand. It must be a weapon that you are proficient with. You can use it as any other weapon, including putting down, throwing, or sheathing the weapon, though the spell ends if it’s out of arm’s reach for more than 1 minute.
The weapon counts as magical for overcoming resistance, and counts as a finesse weapon for the purposes of Bound Between Planes. When you first hit a creature with the weapon, that creature can make a Charisma saving throw. If it succeeds, it gains resistance to all damage inflicted by the weapon (though if you cast the spell again, it must save again for the new weapon). Despite the spell’s name, you can make any melee weapon, not just bladed ones.