Guild Wars 2 Walkthrough – Assist Valiant Ceillech with the Risen

“Burn undead corpses, smash noxious plants, protect Wardens, and battle the Risen in Slieve's Inlet.”

Found in the West of the kennel you need to climb the nearby hill to find the Valiant to get the details on the quest itself. The actual questing is fairly simple.

Valiant Ceillech: “Within the Dream, I learned of the pain and sufferign caused by the undead hordes. My path has been set since I first awakened. I will fight and slay the undead until my last breath passes.”
Hero: A) “How can I help?” B) “Tell me about this place.”
Ceillech A) “Wiping out the undead is the most direct way. Finding any evidence of their goals they've left behind would help, too. The undead are being controlled by a greater force, and I want to know what it's after.”
Ceillech B) “The outpost at Caer Verdant was set up specifically to deal with the undead threat in Sleive's Inlet. We don't know how they get here or what they're after, but we know they have to be stopped.”

To the West of Valiant Ceillech you will find Warden Karu. Talk with him to learn that he is waiting there for his dog, “Newton”. He is running around the swamp somewhere. Tell him that you will keep an eye out for his Sylvan Hound. It is random if you will find him or not.

Look around for Risen Corpses that are sitting on the ground. Just like with the others, they can be burned. Sometimes they will animate and attack your character so be warned about the small risk. It is a very easy way to fill up the track. There are, of course, no lack of undead to kill either.

As you head East into the Swamp itself you will find Noxious Plants that you can smash and unconscious Wardens that need help. The Wardens are sometimes covered by flailing limbs that will attack your character as you revive the Warden. It is important to take some time to clear the area around the Warden before reviving them. The Noxious plants have a chance to explode in a cloud of poisonous gas that will poison your character.

After chasing and and taking care of the Undead in the area you will receive “From Ceillech”, with 52 copper:
“I can't begin to express how much the undead distress me to my core. I'll never forget our experiences at Slieve's Inlet. We nearly died. I want you to know that, wherever your hunt takes you, you have a friend here. - Ceillech”