It Belongs in a Mausoleum!

Set Kings' Rest to Mythic difficulty before entering. This is a personal achievement, so each player must collect all four trinkets themselves.

In the first room of the dungeon, look beneath the baskets to find the first trinket.

Continue through the dungeon to the platform just before the first boss room and collect the trinket at the end of that platform.

In the room with the patrolling Spectral Brute, position yourself near the wall and let the Spectral Brute's Ground Crush ability knock you up to the ledge where the third trinket is located. Face east and stand on the south side of the room near the pillar of the hallway entrance, then position the Spectral Brute behind you. If the Brute keeps missing you, sit down while it casts — sitting prevents you from being missed.

After defeating the Shadow of Zul and just before the last boss, locate the pillar on the right side. Wall-jump against the pillar to find the correct gaps and climb up. You can click the trinket mid-jump, so reaching the very top is not required as long as you can click it during the jump.