It seems I can solo every ettin in Kryta except one.
I don't know of the Luxon Settlement quest ettins are permanent for everybody, but I still have them. Anyhow, I left Beetletun, killed the ettins in that zone, came over to North Kryta, and killed all the ettins there too -- except Smuush. I got into a standoff with him and rarely even got his health too far down. This is the second time I've managed to kill all his buddies but not nail him.
Both times the build was Earth/Ether Renewal:
Ether Renewal (E)
Aura of Restoration
Kinetic Armor
Armor of Earth
Earth Attunement
Stone Daggers
Aftershock
Sympathetic Visage (first time)/Arcane Echo (second time)
I guess Crystal Wave might add more damage than Arcane Echo, but I don't see where it would be enough to matter, given all his Healing Signets. Ditto Obsidian Flame. I also doubt swapping in Rust would do the trick.
But if I go a lot more offensive with this build, I'm not sure how to survive all the way to the one-on-one with him.
Has anybody figured out how to solo a Level 24 Ettin with Endure Pain (Defy? The non-elite one), Healing Signet, and Backbreaker?
I don't see how a Mist Form/Water Magic build with perpetual Rust, Ice Spear, but lame other damage would get the job done either.
Am I missing anything?
F

which gives you a breather. Also, after I kill all the regular trolls and go after Whoop by himself, I turn essence bond off, for faster energy renewal.
. I read they have Daggers, Grasping Earth and Eruption which you will have to dodge. On the other hand, they are level 14 and you have a +42 AL from Armor of Mist. I would say that additional AL, coupled with Aura of Restoration would be enough to kill the Earthborn Ettins because they don't have Healing Signet.