Create Blood Weapon

You materialize a melee weapon of your choice - including one with the finesse property - out of your own crystallized, hardened blood, imbued with your arcane energy with a max reach of 5 feet. Each strike does 1d10 damage. You take 10 temporary points of damage on certain and each strike with the weapon decreases 2 points from that value. The weapon can be dispelled at any time, returning the remaining hitpoints back to the caster. 

The 10 point value increases by 4 for every spell level after 2.