This powerful colossal weapon rocks for bleeding is built into the DLC
Elden Ring DLC Bloodfiend's Arm Location
The Bloodfiend's Arm is one of the best DLC weapons added to the Elden Ring in the Shadow of the Erdtree. It is capable of absolutely destroying certain bosses, including the notoriously difficult final boss of the expansion.
In this Shadow of the Erdtree guide, I'll walk you through how to get the Bloodfiend's Arm weapon, why you want it, and how to get to Prospect Town early in your adventure so you can farm it.
Bloodfiend's Arm is classified as a colossal weapon, and you can get one from any Bloodfiend. You can find these guys in a few different places in the Gravesite Plain and the Ancient Ruins in the Ruah regions, but the easiest place to farm them is Prospect Town, early in the game.