Cornbeard's Shocking Smite

The next time you hit with a melee weapon attack during this spell's duration, if the target is a humanoid it must make a Constitution saving throw or fall prone, becoming incapacitated and unable to stand up until the end of your next turn. 

Each time the target takes damage, It can make another Constitution saving throw. On a success, the target is no longer incapacitated and is able to stand.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, your attack deals an extra 1d6 lightning damage for each slot.