You produce a fast-spinning sharp disc of magical energy and attempt to throw it at a target of your choice. Make a ranged spell attack against the target. On a hit, the target takes 1d6 slashing damage, and the disc becomes embedded in the target. The target must make a constitution saving throw to remove the disc at the start of each of their turns or suffer disadvantage on attack rolls and 1d4 slashing damage on a failed save. This is repeated until the target is incapacitated or succeeds on a saving throw. The disc is removed and the effect ends on a successful save. If the target is being affected by multiple discs, it only requires one saving throw, but disadvantage is applied to remove 3 or more discs at once. The disc falls out and the spell automatically ends after 1 minute has passed.
Using a higher-level spell slot. When this spell is cast with a spell slot of 2 or higher, the user can throw 1 more disc per spell slot higher than level 1 (i.e. 2 discs with a level 2 slot, 3 discs with level 3, 4 discs with 4, …)