The character level for this fight: 90 (Knight). The weapon for this fight: Broadsword.
Lothric and Lorian are the final lords of cinder in the game. You find them in the Lothric castle area after killing Dragonslayer Armour.
Lorian is the guy with the burning sword and Lothric is the one who revives him in the second part of the fight.
Lorian is very aggressive. He attacks quickly and deals lots of physical + fire damage. But he doesn’t have any defensive measures. My strategy was to roll behind him and just trade hits with him. I intentionally took some damage to take down his health as quickly as possible. If you have plenty of Estus flasks and an upgraded weapon this is the easiest way to finish the fight. Sometimes he just teleports behind you which makes blocking with a shield rather useless and drains stamina too quickly. And when trying to dodge you will get hit eventually. So just get behind him, stand there and trade hits with him.
In the 2nd part of the fight Lothric is sitting on his back. So make sure you always attack from behind. When Lorian goes down you have a few seconds to concentrate your attacks on Lothric. When Lothric dies Lorian automatically dies, too. Just don’t let him revive too often or you will run out of health. And make sure you dodge all of his ranged magic attacks perfectly as they deal lots of damage.
Since this is one of the hardest bosses in the game you may want to get another online player to help you. Also restore ember before (or during) the fight for extra health. If you can’t beat him solo you are underleveled or don’t have enough Estus flasks. With a ranged build (archer, sorcerer, pyromancer) he is easy to defeat. But for melee characters he is pretty hard.