Create a Lure: Redemption of Perdeen by combining one Husk: Redemption of Perdeen (bought from Grim Disciples for 250 Planarite) with five Malformed Souls (obtained from Tier 1 expert dungeons). Alternatively, Lure: Redemption of Perdeen can be purchased for 1750 Planarite with Decorated reputation. Use the lure to summon the expert rift "Redemption of Perdeen" from any non raid tear in Stillmoor. You must complete all of the bonus stages and receive the List of Betrayers for quest completion credit. This is an expert rift and can be done with five people. However to insure you complete each phase before the timer runs out, it is recommended you bring seven to ten players.
To see the whole quest series at a glance, see The Saga of the Endless Guide .