Armament of Flesh

Uttering the phrase "úr líkama mínum vopn skal komahe", the flesh on your hand and forearm twists into the shape of a grotesque weapon composed of your flesh. The weapon assumes the shape and form of a melee weapon of your choice. For the duration, you can make a melee spell attack against one creature of your choice. On a hit, the target suffers 1d8 piercing, bludgeoning, or slashing damage (your choice). 

The spell's damage increases by one die when you reach 5th (2d8), 11th (3d8), and 17th level (4d8).