As two actions, you create a shimmering wall of bright light 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 doesn’t need to be vertical or rest on any firm foundation. The wall blocks line of sight, but creatures and objects can pass through it. It emits bright light out to 20 meters and dim light for an additional 20 meters. A creature that enters the wall’s area for the first time on a turn or starts its turn there must make a Fortitude saving throw, which it does with disadvantage if it is an ooze or an undead.
On a failure, it takes 4d8 radiant damage and is blinded until the end of its next turn.
On a critical failure, it takes twice as much damage.
On a success, it takes half as much damage.
On a critical success, it takes no damage.
You can increase the damage by 2d8 for each additional mana expended.