Armor of Astartes

When you cast this spell, you are swathed in powerful hunks of magical, bulky armor. Your AC becomes 15 + your Dexterity modifier.

Whenever a ranged projectile attack would target you. The damage dealt is reduced to 0.

At higher levels When you cast this spell at 4th level you take no damage from magic missile. When you cast this spell at 5th level or higher you are resistant to magical ranged attack damage. At 6th level and higher you increase the duration of the armor for 1 hour.