Tennebraum's alchemical armor

You take a peice of solid material that can provide 2/3rds or full cover be it stone, wood, metal ect . If the material is a power than you need two handfuls of said powder (like ash, sand, or soil ect) or you can use an arcane infused paper to make a self protective barrier of magic with illusory papers that cover you

You create a magical suit of armor made of the material that you chose with an ac of 15 and (4d6 + spell modifier) temporary hit points , at higher spell levels it increases by 1d6 to a max of 7th level. This armor will remain active until it's hit points are exhausted or until it is expelled. When it's hit points are exhausted however you do not take any remaining damage if the damage is higher than the armor' s health unless it is twice the armor's health in which case you take half of said remaining damage (if the remaining damage is odd then take the bigger half)