No. 77 (5e) Channel blade.
The caster chooses one nonmagical weapon of their choice. The weapon counts as a plus one magical version of itself, and the caster has proficiency with that weapon. Additionally, the weapon can return to it's owners grasp as a bonus action, and it counts as a spell casting focus.
Casting time: 5 minutes
Duration: 8 hours
Components: V,S,M ( some black pearls, worth a total of 100 gp)
Level 4? Spell