Chaos structures.

This was with the maximum level of tactics and a ring of protection, plus another 20%.

Why are there so few artworks?
Grand attack +50%
Grand defense +50%
Sword of Legends attack +50%
Ring attack +20%
Ring defense +20%
Attack and defense from the Commander's Helmet +20% (or 30%, I don't remember exactly)
Lionheart Shield defense +40%
That's quite a set!