The Rifthound Regalia is a four-star material dropped by the Golden Wolflord, a Normal Boss that appears in Inazuma. It's an Ascension material for Hanamizaka's notorious oni, Arataki Itto, and possibly other new characters that may release in the future.
The Golden Wolflord is the ruler of the Riftwolves and is a tough Boss to fight, especially due to its massive Corrosion Damage, so make sure to come to battle prepared!
Where to Find the Golden Wolflord
The Golden Wolflord's base is located in the south of Tsurumi Island. Due to the fog on the island, you need to complete the Through the Mists questline to comfortably farm Riftborn Regalia. Apart from that, there are no other requirements that need to be fulfilled to unlock the Boss, so simply head to the area marked up in the image above to face the Golden Wolflord.
Golden Wolflord Battle Tips
The Golden Wolflord is a tough Boss to beat, as it deals a large amount of Damage, along with other tough mechanics. Be wary of the Corrosion debuff and its ability to turn into a giant Tornado, shoot laser beams, and do a huge lunge Attack.
It's highly recommended to bring in a shield Support (but keep in mind that shields are not immune to Corrosion) or a healer for better survivability. It's also pertinent that you bring in a Geo Damage dealer, as the Rifthound Minions can only be defeated with this Element. And as the Golden Wolflord is a flying enemy, make sure to bring a ranged DPS.
It costs 40 Original Resin to claim rewards after successfully defeating the Boss.