Wall of Wood

You create a wall of wood on the ground at a point you can see within range. You can make the wall up to 30 feet long, 10 feet high, and 5 feet thick, or you can make a dome to 20 feet in diameter, 20 feet high, and 5 feet thick.

Each five-foot segment has 15 ac and 50 health the wood is vulnerable to fire damage and resistant to bludgeoning and piercing damage. 

If part of the wall is made in a square with a creature, then the creature must make an athletics or acrobatics check against your spell save dc. The creature takes 6d6 bludgeoning damage on a failed save and is moved to an unoccupied adjacent square of your choice, or half as much damage and may move to an unoccupied adjacent square of its own choice.

as an action, the creature that casts the spell can make an opening for a creature of medium or smaller to walkthrough

if you upcast this spell the tree segments gains 1ac and 20hp.