I'll put this mostly into comments instead of it being a wall of text. I've scavenged these from a bunch of different articles and videos, plus some help from Kolanaki. Some of it is on the wikis now
Golden Order set
Acquired by beating the Noble Broken Mask when he invades you in Leyndell
Golden Order flail: A flail with three golden rings for striking heads, the sacred signature weapon of the esteemed Broken Mask. The goldenbands are modelled upon the Elden Ring itself, half-corporeal and half formed of light, all in the process of shattering.
Causality's Wrath (Golden Order flail unique ash of war): A skill which houses the wheel of causality within the user's frame. Once activated, perform an additional input to unleash an attack. The potency of the attack builds charge tiers based on the number of hits taken.
Broken Gold Mask: A mask designed to resemble a blazing golden halo, though a piece is now broken off. The attire of the honorable Goldmask's closest disciple, and dear friend, who accompanied him on the great venture. Enhances incantations and skills that harness Causality. Upon the splintering of the Golden Order, so too did these companions part ways. One kept the faith, though the faith itself was broken, while the other fell completely to his own doubts.
Gold tattoo (chest): An intricate tattoo, etched into the flesh. The work of the honorable Goldmask's closest disciple, and dear friend, who accompanied him on his great venture. Increases faith to the detriment of focus. It is an artificial tongue, create to express the Golden Order itself, now an unrelenting curse that binds the entire body with its rule. "Do your utmost, to rid yourself of doubt."
Gold tattoo (arms): An intricate tattoo, etched into the flesh. The work of the honorable Goldmask's closest disciple, and dear friend, who accompanied him on his great venture. Increases faith to the detriment of focus. It is an artificial tongue, create to express the Golden Order itself, now an unrelenting curse that binds the entire body with its rule. "Do your utmost, to rid yourself of doubt."
Gold tattoo (legs): An intricate tattoo, etched into the flesh. The work of the honorable Goldmask's closest disciple, and dear friend, who accompanied him on his great venture. Increases faith to the detriment of focus. It is an artificial tongue, create to express the Golden Order itself, now an unrelenting curse that binds the entire body with its rule. "Do your utmost, to rid yourself of doubt."
A new glimpse into the guy that leads to my personal favourite ending in the game. I've seen some theorising that this character is Corhyn, or perhaps an alternate Corhyn, as he breaks down when Goldmask accepts that Marika is Radagon. I don't personally think that this works, as a) Broken Mask invades as soon as you learn about it yourself, before you tell Goldmask, and b) I don't get the impression that Goldmask considers Corhyn a dear friend. Increasing faith to the detriment of focus is interesting, as it is almost explicitly saying that blind commitment to the Golden Order is functionally the same as the Frenzied Flame