As two actions, you create a wall of fire at a point within 20 meters that lasts for the duration. The wall can’t occupy the same space as a creature or object and it needs to be vertical, but doesn’t need to rest on any firm foundation. The wall blocks line of sight, but creatures and objects can pass through it. A creature that enters the wall’s area for the first time on a turn or starts its turn there must make a Reflex saving throw.
On a failure, it takes 6d6 fire damage and is burning 2.
On a critical failure, it takes twice as much damage and is burning 4.
On a success, it takes half as much damage and is burning 1.
On a critical success, it takes no damage.
You can increase the damage by 2d6 and the burning level by 1 for each additional mana expended.