Donkegedon

On casting select a 30 feet wide line within spell range. You can choose line direction at your will. If the line is completely blocked in visible range by solid obstacles (2 feet of stone, 1 feet of metal) the spell fails.
Until the start of your next turn increasingly louder ramble is heard in a 300 feet radius.
Any creature that can hear sound or feel ground vibration can make an Intelligence saving throw. On success the creature becomes aware of a general spell effects and can try to leave the area on its turn.
Before the start of your next turn, a herd of 200 donkeys arrive, moving along the line. Any creature in spell area takes 200d4 bludgeoning damage. Donkeys don't stop and destroy any obstacles not strong enough to prevent their movement and disappear over the horizon.