Sword of Disaster

 You create a blade-shaped planar rift about 3 feet long in your hand. This magic blade lasts until the spell ends.  It counts as a simple melee weapon with which you are proficient. It has the finesse, light, and thrown properties (range 20/60). When you cast this spell, you can make up to two melee spell attacks with the blade, each one against a creature, loose object, or structure within 5 feet of the blade. On a hit, the target takes 4d12 force damage. This attack 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).

If you drop the weapon or throw it, it dissipates at the end of the turn. Thereafter, while the spell persists, you can use a bonus action to cause the sword to reappear in your hand.

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