Guild Wars 2 – Holding Back the Darkness

It is time to go lend the Wardens of Caledon Forest a hand to ensure that you can get the information you seek in regards to the Shield of the Moon. Head to the Verdence Waypoint and travel just a little to the North of that to find the starting point for this instance.

Follow the path to the Southeast then Southwest to reach the starting point of the mission itself. Approach Caithe and the Warden to start the sequence of the mission itself:
Caithe: “Warden, we have come to aid you.”
Warden Llewyr: “Aid me? Firstborn, you honor me by visiting the caer, but I'm afraid I don't know what you mean.”
Hero: “Warden Llewyr, we want to ensure the successful transfer of the Nightmare Court prisoner Renvari to the Grove.”
Llewyr: “By the Tree, that's fortunate news! We spotted the enemy gathering outside Caer Verdant only a few hours ago. They want him back badly. I fear they are planning a major assault.”
Hero: “Then we will stand with you until the Court is defeated. Renvari can be taken to the Grove once the danger has passed.”
Llewyr: “Thank you, both of you. It will be an honor to fight alongside a Firstborn and a Valiant of the Wyld Hunt. Help us prepare the defense; the attack will come soon.”
Caithe: “I will leave 'preparing the defense' to you Valiant. My blades serve me well enough.”

Head to the South and talk with Guard Dilys. She will explain how the seeds work, that there are menders, turrets and traps. Grab one of them and head down the slope. You only have a short time to prepare for the attack. Plant the best variety of seeds that you can in the minute you have before the attack begins. This takes a lot of running and quick decisions.

Once the battle begins you will be thankful for the turret seeds. The first is a brood of 4 Nightmare Spiders and a Nightmare Soldier, all lvl. 4. Tear through them. The second wave is much the same with just with Thorn Hounds instead of Spiders. The third wave is back to spiders, in the same mix as before. The fourth is where things get mixed up. You have 2 Nightmare kennelmasters, 4 Nightmares Hounds and 3 Spiders. The seed turrets will really help here, if they have survived this long. The fifth and final wave consist of a Nightmare Court Noble, lvl. 5, and 4 other Courtiers. Just pound away on them. Any remaining turrets will be a great help in this fight (as it is the tail end and you only had a short while to recover). When the dust has settled it is time to talk with Llewyr again:

Llewyr: “Thank the Mother Tree! The caer is safe, and the Wardens can move Renvari to the Grove. Your help was invaluable.”
Hero: “I'm sure the Nightmare Court is wondering what went wrong. It's satisfying to know they'll be fuming for a while.”
Caithe: “I'll escort the Wardens and their prisoner to the Grove. Renvari will arrive unharmed. Although, if he doesn't cooperate with us, he may not remain that way.”
Hero: “Would you check on Tiachren as well. He will want to be told how we're progressing. He misses Yselta so much.”
Caithe: “Losing someone to the court is difficult. His pain will run deeper than the poison. I will speak to Tiachren. Then I will meet you at the jail, and we will make Renvari tell us what he knows.”

Collect your reward, leave in the instance and it is time to start “A Sly Trick.”