The Hedge Maze flags the raid for The Lair of Terris-Thule. Keep Thelin Poxbourne alive while he walks the maze and collects dagger pieces.
Access
In Plane of Tranquility Sick Bay, hail Adroha Jezith and say tortured by nightmares.
Find Thelin Poxbourne in the northeast of Plane of Nightmares, across the river inside the hedges. Up to three group leaders say I am ready to port in. Once everyone is inside, hail Thelin and say I am ready again to start the walk.
Rooting Thelin and mem-blurring him keeps him from aggroing or wandering.
Path
Thelin collects dagger pieces around the maze. Waves get larger as he goes. When he reaches the fountain in the center, A Construct of Nightmares spawns.
Loot the Dagger Blade Shard from the construct and give it to Thelin. Hail Thelin to zone out and receive the flag. That flag opens the Lair of Terris-Thule portal in Plane of Nightmares.
<A Construct of Nightmares> - CH Chain: 4sec, 6sec slowed, Hits 1184, Slowable, 300k HP
After the maze
Zone into The Lair of Terris-Thule and kill Terris-Thule. Keep the fight in her chamber. Dream defilers spawn at 79% and 69%. Direption of Dreams (unresistable PBAE dispel) at 50%. Four gargoyles at 40%. Hail the Planar Projection, then hail Elder Poxbourne in Plane of Tranquility.
<Terris-Thule> - CH Chain: 2sec, 3sec slowed, Hits 977, Flurry, Dual Wield, Slowable (75% mit), Procs: Touch of Night (Single, 720 lifetap, Magic -200), Casts: Direption of Dreams (PBAE, mass dispel, Unresistable) at 50%, 450k HP