Excruciating Pain

A creature of your choice that you can see within range experiences excruciating pain to the point where they are immobilized by it. The target rolls a Constitution saving throw, and on a fail, falls prone, becoming incapacitated and unable to stand up for the duration.

At the end of each of its turns, and each time it takes damage, the target can make another Constitution saving throw. The target has advantage on the saving throw if it's triggered by damage, or another source of pain. On a success, the spell ends.