Wiznak's True Shield

You extend your hand in front of you, and make a shield of pure magic. The shield will take any damage instead of you, but it does not block anything thing that can go around corners of walls, such as the spell "Cloudkill". The shield has 45 temp. HP and the shield lasts for a single turn. If the shield drops to 0 HP, it breaks. If the shield breaks, you can make a concentration check, except the DC is 10+Double the spell's level. On a success, the shield stays intact at 1 HP.

When you cast the spell using spell slot of 4th level or higher, the Temp. HP of the shield goes up by 15 points for every spell slot level past 3rd level.