Back on the topic of Wall of Thorns, I do find it over the top. It is not just a wall like wall of force, it can trap creatures inside it. Your 9th level fighter might be able to make a DC25 strength check, sure, and he might not take any damage doing that, but he will only move 5' with his full round action. You can't use fly against the wall of thorns if you are already inside it.
Our druid liked to use wall of thorns to trap opponents and then a wall of fire in the same spot to slowly roast them. Archery against the trapped creatures is also quite effective. We house ruled the spell after an opposing druid wrecked the party with this one spell.
Our druid liked to use wall of thorns to trap opponents and then a wall of fire in the same spot to slowly roast them. Archery against the trapped creatures is also quite effective. We house ruled the spell after an opposing druid wrecked the party with this one spell.