I’ve been pretty sick this weekend. CANCEL DND SICK! But it does give me some ideas….
Casting Time: 1 action
Range: 30 feet
Components: V, S
Duration: 1 hour
You attempt to hamper a target in range with a debilitating cough. Choose a target in range. If it fails a Constitution saving throw, it gains a debilitating cough. Each round if it attempts to do more than just stay still and rest, it must make a Constitution saving throw. On a failure it gains disadvantage to all attacks and skill checks for that round as well as saves made before the beginning of its next turn. Any effect that removes a disease or magically heals damage removes this cough.
At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, you can target one additional creature for each slot level above 1st. The creatures must be within 30 feet of each other when you target them.