It is advised to max out item discovery not only for the higher chance to get a drop but also since it's possible to get multiple items from the same corpse, being this one of the best ways to farm for hard souls that the player can turn in whenever they want. Personally I was able to beat him after 2-3 tries, but I also summon help for most boss fights. When he starts summoning a phantom, it can get tricky.
This is a time where a powerful undead individual must sacrifice themselves to. The First Flame, the eternal fire that powers the world, is dying yet again and brands many people dead and alive with the Darksign, signifying that they will become undead. As its name implies, the Soul of Cinder is an amalgamation of every creature to ever give themselves to the First Flame, their bodies and souls being used as fuel to keep the Flame burning, therefore also. The Lords of Cinder are the four major story bosses you fight in the game. It is the physical manifestation of every previous Lord of Cinder.