Uproot

You cause a root from Yggdrasil, the World Tree, to wrench its way out of the ground. You must target an area of earth or stone. The root is massive, pushing creatures that were above it 10 ft. away and dealing 5d6 bludgeoning damage. The root remains, creating a 10 ft. thick, 30 ft. long, and 10 ft high area of wooden terrain. Moving through the roots involves an Athletics check with a DC equal to your spell save DC to climb over it or force your way though the tangle of roots. Huge or larger creatures can easily climb over the root without a check. Hacking through all of the wood is unfeasible but probably could be done with an hour of work using a slashing weapon.