These two wights at Garth Agarwen are very important since the chest in their area holds a key and the greatly appreciated Ferchu bow for hunters.

Edan can heal Esyld and Esyld can summon hillmen. The best approach is to disable one by stunning or traping him. Since both can do great damage I recommend taking on Edan first since he can heal even trapped.

Protect the main healer and talking is a must to not remove the wights from the stun.