The Destiny 2 Avalon secrets are little puzzles hidden throughout the new Vexcalibur exotic mission that reward you with enhancement prisms, upgrade modules, red border weapons, and even give you a small dose of lore about Asher Mir and what he’s up to these days. Unlocking these secrets also rewards you with unique triumphs in the Season of Defiance node.
You’ll need to find the Substrate secret as part of the Vexcalibur Expert Authorisation Code quest, which gives you access to the first intrinsic upgrade for the glaive. If you’re still exploring Neptune, there are also Neomuna action figures (opens in new tab) to find and Strand guns to grab from Terminal Overload (opens in new tab). Otherwise, here are all of the Destiny 2 Avalon secrets so far.
Data Retrieval: Substrate
This first secret is the one you need to get the Vexcalibur intrinsic upgrade and to complete one of the steps in the Vexcalibur Expert Authorisation Code quest. After you drop into the Vex milk canals, use Vexcalibur’s shield to get through the first barrier, jump up onto the bit sticking out the wall on the left, then jump up to the green switch near the top of the room and activate it.
Keep heading through the level until you get to the Vex milk canal with the two harpies, then look up to see a barrier and a ledge. Jump up, use the Vexcalibur shield to pass through, and press the green switch inside. A chest will appear, granting you the intrinsic upgrade. Be sure to open this again on your first weekly run of Avalon, since it will give you a weapon pattern instead.
