While there are a lot of weapons in Elden Ring's Shadow of the Erdtree DLC, the Bloodfiend's Arm stood out to me the most. Here's how to find Bloodfiend's Arm in Elden Ring's Shadow Realm.
How to get Bloodfiend's arm in Elden Ring Shadow Of The Erdtree (Map Location)
The best place to get the Bloodfiend's Arm in Elden Ring Shadow of the Erdtree is Prospect Town. You can reach this location early on, as it is located west of the Gravesite Plains. There are several Bloodfiends in Prospect Town, but you are looking for the ones that are carrying the mace-like weapon. Defeat them and you have a chance to get the Bloodfiend's Arm as a drop. Bloodfiends can be found in and west of Prospect Town. Bloodfiends can be found in and west of Prospect Town.
Bloodfiends can also be found east of the Gravesite Plains, outside the entrance to the Ruined Forge Lava Intake. They aren't as plentiful as they are in Prospect Town, and I had better luck finding the drop in Prospect Town than this location. I recommend trying both to ensure you get your hands on the Bloodfiend's Arm.
Bloodfiend's Arm is not only a visually appealing weapon, but it also has decent stats and uses. It scales with both Strength and Arcane, with both being fairly equal in upgrading this weapon. It has the Endure ability, which allows you to take a stance, which pairs well with Rellana's Cameo. Using Endure increases your resistance and takes less damage. Combining it with Rellana's Cameo increases your defense and attack while holding a stance for a while, giving you the best of both worlds.