Blade of Time

You infuse ur blade with the twisting energy of time itself. The effect lasts for the duration. When you cast this spell, your blade on a hit, does 4d12 force damage. Your attacks scores a critical hit if the number on the d20 is 18 or higher. On a critical hit, the blade deals an extra 8d12 force damage (for a total of 12d12 force damage).

The blade can harmlessly pass through any barrier, including a wall of force.