Rapier of Magic Missiles

Rare item (any weapon), Requires Attunement

"A weapon imbued with a magical spell, that can be disperesed upon the weilder's choosing. Often used by spellcasters.

It is not uncommon for spellcasters to carry weapons, but they seldom use them unless in moments of desperation.

But in certain circumstances, a caster may pledge themselves to a way of martial combat to increase their combat effectiveness and versitility. Perhaps the onwer was one such individual?"

This weapon has the spell Magic Missile stored in it at 1st level. Whenever you hit a creature with this weapon, you may choose to cast the spell as part of the same attack dealing an additional 3d4+1 force damage.

Alternatively, as an action, you may cast the spell from the sword, and functions as if it were cast by a wizard, or sorcerer.

Once the spell has been used, the weapon becomes a regular, non-magical weapon and doesn't regain this ability until you finish a long rest. Or expend a spell slot of 1st-level or higher, so long as you know the spell Magic Missile.