Feldon The Icy Keep (an easy x4 raid zone added in Game Update 56) seems to have taken its place as this expansion’s Ward of Elements. We’ve received reports that, with the exception of the final boss, this zone is appropriate for raid groups of as few as 11 players seeking to gear up and work their way into more difficult raiding.
There have been some issues with later bosses which Gninja has just submitted some fixes for:
[I’ve] just checked in a fix that cleans up the Vrewwx fight as well as fixed the respawn points. Now once you have defeated the Corrival you can respawn in his room. Once the Brothers have been killed you can respawn in there and once D’Ina has been killed the respawn resets to the front entrance since its a faster run from there.I also made the front keep doors allowed to be openned if you have completed the quest “Knocked Out Cold” Thus having killed the dragon before in either normal or challenge mode and completed the questline from the zone. This means those wanting to fight the dragon can do so by openning those doors killing D’Ina and going after the dragon.
Hopefully these changes should make it live next hotfix.