Devourer Patrasche is a demonbeast fairy tale you can find in BLACKSOULS, in the Cathedral area that you can get through the Graveyard Town Elixir. When you enter the Cathedral you will see him killing his own companion Nello. These characters are based on Nello and Patrasche from the 19th-century novel A Dog of Flanders.
Fighting him is difficult at the beginning of the game, but it is also completely optional. He has a lot of health and he can throw a lot of attacks at once after charging for a little bit. Killing him will give you 24000 souls and the Dog of Elixir fairy tale.
Appearances | BS2
Like many other fairytales from the first game, Patrasche also makes an appearance in the second game. You will be able to summon him for the fight against the Beast of Conceit, where he’ll be addressed as Sacrificed Patrasche.
This fight is located in the Carroll River area, at the bridge that leads to Jabberwock. Summoning Patrasche can slightly help you against the boss fight, but also getting his fairytale will allow you to get a Dream Soul which allows you to level up 5 levels at once.
To get the Dream Soul, just put his fairytale into a bookshelf in the Fairy Tale Archive. You will get the fairytale after you beat the Beast of Conceit with him summoned by your side.