Once you return to the Rhogar realm after defeating the Champion and the Beast bosses make your way up to the Panorama, to the area where we fought the first Dimensional Beast in the game. As you continue along the platform towards the path to the Abandoned Range, you’ll encounter a Demon Hound. Attacking this will see it run off.
Make your way down the snowy path to the Abandoned Range and Kill the Dimensional Beast at the base of the stairs. From the fire here, take the left path to find a bunch of burning debris. You’ll also find the Demon Hound we attacked earlier that ran off.
Attacking it here will have another pair of Demon Hounds spawn nearby and attack you (there is also a Forger on the far side of the area so try to keep away from there!). Once you have killed all three Demon Hounds, one will have dropped an item. Loot this for a Trinket (The Keep) .