Sengoku Tresaure Set

Level 150 set consisting of Hat, Overall, Shoes, Gloves, Cape, Belt, Shoulder, and Weapon.
They can drop from Madman/Ranmaru, or crafted using recipes he drops and special shards he and other bosses (such as Zakum) drop.
They used to be completely untradeable, which made them nearly useless. But this latest patch changed them to tradeable-until-equipped, making it much more feasible to get a complete set.

If you have a character who is a Smith, you can see the item stats and the set bonuses by hovering over the item names in the smithing window.

Hmmm I thought they were talking about the new 3 item set you get by completing the new role play dungeon with each character. I might be wrong tho.