Blood Armor

In the Second Age, Armant La Mortas found himself standing in front of Diabolos the Lord of Shadows with a mass of dead humans, orcs, and a few elf's dead on the ground around them. Armant brought a smile to his face, seeing this unfold. "I'd say this is a good day for you to return back to the elemental plane, don't you think Diabolos?" Armant said while slowly swirling both of his open hands in a circular motion by his side. Blood from the fallen humans, orcs and elf's around them started gathering into a red mist right at Armant's feet, forming into a dark red spectral armor. As the mist was moving up Armant's legs, to his body, to his arms and finally his head, the rest of the mist continued to form into a dark red spectral armor. Once it was complete, Armant tilted his head just a little to the left as he said, "Shall we begin?"

You touch a willing creature who isn't wearing armor, and a red mist surrounds the creature turning into a dark red spectral armor until the spell ends. The target's base AC becomes 15 + its Dexterity modifier. The spell ends if the target dons armor or if spell caster dismiss's the spell as an action.