Visimir's Discordant Blade

You tear open a narrow wound in the air and draw out a floating blade of black, discordant force. The blade appears in an unoccupied space you can see within range and lasts for the duration. When the blade appears, you can make a melee spell attack against one creature within 5 feet of it. On a hit, the target takes 3d10 psychic damage, and the blade fills its thoughts with clashing echoes. Until the start of your next turn, the target cannot take reactions, and it has disadvantage on the next Constitution saving throw it makes to maintain concentration.

As a bonus action on each of your turns, you can move the blade up to 30 feet to an unoccupied space you can see and repeat the attack against one creature within 5 feet of it. The blade occupies its space but does not block movement or provide cover. If the blade is ever more than 60 feet from you, the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d10 for each slot level above 4th.