Blumenthal's ice weapon

You create an ice weapon with you're automatically proficient that has slashing or piercing damage. 

You can use the weapon to fight with it in melee or project it against enemy. If you project it, it deals 2d6 cold damage and the target have to make a strength saving throw or be pushed back 10 feet. If enemy would hit any solid structure because of being pushed, it needs to make a strength saving throw or be impaled and receive another 1d6 cold damage plus it gets stunned until the start of its turn. 

If you want to use it in melee, the weapon is hovering in your 5ft radius and has the properties of the weapon you choose to make + your spellcasting ability modifier.

At Higher Levels: When you cast this spell using a spell slot 3rd level of or higher, the damage increases by 1d6 for every slot level above the 2nd.