Fallen Guardians is an encounter inside the Felwood set of Mercenary Bounties.
This bounty can be picked up from the Bounty Board and recommends a Party level of 23 to complete it.
You can unlock Fallen Guardians by first completing The Anointed Blades.
Completing this Bounty will unlock the Xavian Satyr Bounty.
Information on this page is datamined and subject to change before the launch of Mercenaries on October 12.