Backplate of the Servant

Backplate of the Servant of the prime pantheon. A 1of5 pieces of armor that let a mortal to serve in the presents of the pantheon. The backplate grant all the constitution needed to serve the gods.

Your total level >5 Your Constitution Score =20, +2 to AC, advantage on Constitution saves.
Your total level >10 Your Constitution Score =22, +3 to AC, no attack has advantage against you.
Your total level >15 Your Constitution Score =25, +4 to AC, damage reduced by 1d10+ Constitution Modifier your Proficiency Bonus times per long rest.
Your total level =20 Your Constitution Score Your con=30, +6 to AC, all physical attacks against you are at disadvantage.