Like all the dungeons in , Sundered Doctrine holds many secrets, including a few secret reward chests for those who know where to look.
These hidden chests are commonplace in end-game content, and any player who's raided or played a dungeon before knows to keep an eye out for puzzles, doorways, and other nooks and crannies that seem out of place.
Often, a keen eye will see players rewarded with another loot drop, a special piece of lore regarding their location, or even a piece towards a new exotic catalyst.
Sundered Doctrine has two secret chests, and like all dungeon/raid secret chests, they can only drop loot from the dungeon/raid that the player has already collected. This means if you've only done one encounter and you get gloves when you head to a secret chest, you'll get gloves no matter what, like I did. Repeated drops are annoying when you're looking for god rolls of the new dungeon weapons, but like all dungeons, you have to have some patience to get the reward you're looking for.
After the first encounter, you'll head further into the Pyramid by following the steps downward and dropping down off either side of the stairs.