From the 2nd DLC description: "New units, new mission types, new research, new maps, new weapons and armor, and a brutal challenge. So where is the armor?
Lost in the ruins of the ancients.
Without joking, unfortunately not implemented.
Unfortunately there is not new armor for PX soldiers.
But Guardians have indeed fancy shields, and Siren Armis has improved armor (golden, thanks to Orichalcum exotic material I think)
And there’s the Crystal Chiron and the Umbra Arthrons (Gas). So lots of new armor, just not for the player.