Enotria: The Last Song [Demo] || Vermiglio, the Red Prior (Boss Fight) 

You get it before Quinta. When you get to the portal that opens the bridge to Quinta, go to the left, you'll see parts of that bridge that have fallen. Go there, fall damage is really low, like in Elden Ring. Over there, at the end of the path (which will take you back to the portal), you'll need to find a second portal, complete it and then you'll find a chest with the sword inside it

Unfortunately I don't remember 😅 I have deleted that run, since every time the demo gets updated, you need to delete the save files However, I can tell you that I'm not good at making builds in souls and soulslikes, so don't ask me, lmao