Trklntry
Terrarian
Ancient Shadow Armor has been in the game since 1.2, as of 1.4.0.5 there isn't a Crimson counterpart. To be fair though, the Crimson Biome itself had also freshly been added in this same update. It seems logical that there should also be an Ancient Crimson Armor partially replicating the older sprites of the Crimson Armor, as is with Ancient Shadow Armor. That being said, this inconsistency may be intentional game design to boost the difficulty of Crimson Worlds.