Alymreus's Anti-magic Blade

You evoke a ethereal blade in your free hand. The blade is similar in size and shape to a longsword, and it lasts for the duration. You can give the blade to another person but it appears in your hand again after they attack with it.

As a attack action, you can make a melee spell attack with the ethereal blade. On a hit, the target takes Force damage equal to 2d10 plus your spellcasting ability modifier.

The target takes an additional 1d4 additional Force damage for every spell slot over 5th level.

Using a Higher-Level Spell Slot. The damage increases by 1d10 for each spell slot level above 5th.