Armor of Astartes

You touch a willing creature who isn't wearing armor who becomes swathed in powerful hunks of magical, bulky armor. The target's base AC becomes 15 + your dexterity modifier (max of 2). The spell ends if the target dons armor or if you dismiss the spell as an action.

Creatures wearing this armor have disadvantage on stealth checks

At higher levels When you cast this spell at 4th level or higher you gain resistance to non-magical ranged attack damage for the duration of the spell. When you cast this spell at 5th level or higher you become resistant to magical ranged attack damage for the duration of the spell. At 6th level and higher you increase the duration of the armor for 1 hour per level of spell cast (9th level lasts 8 hours).