Ground

2nd level abjuration
Casting Time: 1 action
Range: 90 feet
Components: V S
Duration: Up to 10 minutes, concentration
Classes: Shaman
You target a creature that is medium or smaller in size, and has a flight speed, and enforce your will upon it. The creature loses the ability to fly for up to ten minutes, and if it is already flying it will fall. If the creature falls more than 10 feet, it takes 1d6 bludgeoning damage for every 10 feet it fell, to a maximum of 20d6. The creature lands prone, unless it avoids taking damage from the fall.
At Higher Levels. You may target a creature of one size category larger for each additional spell level above 2nd.