Tree Strike

You plant the stick used for the casting of this spell in the ground before you, and a magical tree springs up. The tree is 20 feet tall, and 5 feet thick, It has Ac 20, and hit points equal to twenty times the level of this spell. As a bonus action, or reaction to being attacked or a creature leaving your reach (your choice when you cast this spell), you may command the tree to strike. When the tree strikes, it falls down in a direction of your choosing. Any creature in a twenty foot line centered on the tree, and extending from the direction that you chose must succeed on a dexterity saving throw, taking 2d10 bludgeoning damage on a failed save, or half as much damage on a successful one. After the tree strikes, it remains on the ground as a non-magical large object for 1d4 rounds. The tree instantly vanishes if you lose concentration, or if the duration is over.

At higher levels: When you cast this spell with a spell slot of  2nd level or higher, the duration increases by 1 minute for each slot level above 1st. The damage done also increases by 1d10 for each slot level above 1st.