In the latest Patch 9.2 PTR build, the two pieces of Tier Gear which drop from the final three bosses in Sepulcher of the First Ones will now drop at a higher item level. The final 3 bosses of Sepulcher of the First Ones drop pieces of gear that is 7 item levels higher than the rest of the instance, similar to end bosses from previous raids.
These bosses also will not be available until Week 3 of the Patch (Week 2 of the raid). In previous 9.2 PTR builds, Tier pieces would not benefit from this increased item level modifier.
However, in the most recent 9.2 PTR build, these Tier pieces now benefit from an increased item level off of the final 3 bosses making them drop at Item Level 285 on Mythic difficulty, while the earlier bosses will still drop Item Level 278. This means that Sepulcher of the First Ones will drop the following pieces of Tier on Mythic Difficulty:.
Hands (Item Level 278): Lihuvim Pants (Item level 278): Halondrus Helm (Item Level 278): Anduin Shoulders (Item Level 285): Lords of Dread Chest (item Level 285): Rygelon . Read more on wowhead.com