Mantis Knight Blade

2-level Conjuration

You magically part a nonmagical Staff, summoning a weapon of the feywild used by the nimblest their knights, the Mantis. This magic weapon counts as a simple melee weapon with which you are proficient. It deals 2d6 slashing damage on a hit and has the finesse property. When you roll the same result on two of the weapon damage die, you can immediately make another attack against the same target, potentially provoking this feature again. Additionally, when you attack charmed targets with this weapon, you make the attack roll with advantage.   The spell ends if you cast it again or if you let go of your weapon. When the spell ends, the staff grows back together, the weapon returning back to its Mantis in the Feywild
At higher levels: When you cast this spell using a 5th, 6th, or 7th level spell slot, the weapon damage increases to 3d6. When you cast using a 8th or 9th level spell slot, the damage increases to 4d6.