History of Assistant's Assistance

How to complete

Part of the Vexcalibur exotic mission triumphs (Season of Defiance), counting toward the Queensguard seal. Uncover the secret entrance to //node.ovrd.AVALON// (a cave guarded by a Harpy in the European Dead Zone) during the exotic quest.

The triumph can fail to register even after you find the cave; if it does not, retry.