Although the normal Stalwart Horn Charm and the +1 variant are located in the Lands Between, the +2 can be found in a fairly dangerous cave in Elden Ring Shadow of the Erdtree DLC. You will need to fight a variety of enemies and get ambushed many times until you reach the Talisman.

According to the game, the Stalwart Horn Charm is worn by Ancestral Followers as they believe that the horns of an elder beast will keep budding like antlers until it transforms into an Ancestral Spirit.

5:45
Related
Shadow Of The Erdtree: Thiollier Full Quest Walkthrough - Elden Ring DLC

Following Thiollier’s questline is important since he’s one of the most interesting characters in Elden Ring, Shadow of the Erdtree DLC.

Stalwart Horn Charm +2 Location In Elden Ring Shadow Of The Erdtree

bonny gaol location in elden ring shadow of the erdtree

The Stalwart Horn Charm +2 in Shadow of the Erdtree is located in the first half of the Bonny Gaol in Scadu Altus. The cave can be accessed by heading south from Bonny Village and crossing the bridge to the other side. Keep going south until the Bonny Gaol entrance appears.

Once you're inside, activate the Site of Lost Grace and proceed forward to reach a big area filled with hanging pots. Go down the slope and kill the enemy. Go west and defeat the enemy sitting on a chair. Be careful of the group that will ambush from the right side and then proceed forward to open the gate.

Kill the enemies in this room, then jump through the hole to land in a watery area full of skulls and bones. Proceed east where there are a couple of rats and climb the ladder at the end of the path. Kill the enemy and claim the Stalwart Horn Charm +2.

scadu altus map fragment location in elden ring shadow of the erdtree

Bonny Village can be accessed easily from the small hole found in Moorth Ruins. As for Scadu Altus, it’s accessed after defeating Rellana, Twin Moon Knight, or using the sealed Spiritspring south of Fort Reprimand down the cliff.

Stalwart Horn Charm +2 Effects In Elden Ring Shadow Of The Erdtree

stalwart horn charm +2 effects in elden ring shadow of the erdtree

The Stalwart Horn Charm +2 Talisman vastly raises players’ robustness. To be more specific, equipping the Talisman will provide the Tarnished with more resistance to blood loss and frost. Considering some enemies like the Divine Beast Dancing Lion will inflict heavy frostbite damage, it's not a bad idea to equip the Stalwart Horn Charm +2.

As for blood loss, there are a lot of enemies that inflict blood loss which are scattered all over the Shadow Land. Equipping the Stalwart Horn Charm +2 doesn’t guarantee that Tarnished won’t get hurt, but it will lessen the damage.