Decastave

You instantly call into existence a quarterstaff made of force, about 8 feet long and 2 inches in diameter. The staff lasts only as long as you keep it in your hand. If it leaves your hand or if you give it to someone else it vanishes. You can use the decastave in combat by making a melee spell attack, doing 2d8 thunder damage on a hit. In addition, the target must make a Constitution saving throw. On a failure, it is Deafened for the duration. The target can make the saving throw again at the end of each of its turns, ending the effect on a success. Once a creature succeeds on this saving throw, it is immune to the deafening effect of the decastave for 24 hours.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for every two slot levels above 2nd.