Crystallize Weapon

You cause any melee weapon you are holding to become covered in a thin ultra sharp crystal coating. The crystal adds an additional 1d8 slashing damage, even to bludgeoning weapons.

The crystal will stay on the weapons for as long as the caster is holding them. If the weapons are dropped the crystal coating will stay for 1 additional round before shattering into dust leaving just the melee weapon behind.

At Higher Levels. For every 2 spell slots add an additional 1d8. So a weapon with this spell cast on it using a 2nd level spell slot would get an additional 2d8 added to the weapons damage. Using a 4th level slot adds 3d8 and so on till it maxes with the use of an 8th level spell slot equaling 5d8 additional slashing  damage added to the weapon.