Curious if anyone out there have collected all of the aetherytes and gates currently available in the game. Below is what I have left and most of them seemed pretty impossible (to solo) during my attempts, but if you have any tips, I would really appreciate them!
Wyrmking's Perch - I think accessible through the tunnel just NW of Camp Riversmeet. Populated with Toxic Toads and bats from the south end to middle, which can be soloed easily. North end filled with bombs (Puroboros I think), there were as many as 7-9 and clumped together. Doesn't seem passable unless you get really lucky.
Feathergorge - Haven't found the entrance, I suspect it's near Weeping Vale because I had no luck around Dragonshead.
Oakwood - Both tunnels have 2-3 Smolenkos. I guess if the stars aligned you can sneak behind them, but I have not yet successfully done so.
Lasthold - Tight corridors with Guivre/drakes makes it pretty hard to get through. No success yet.
Lichenwood - Haven't tried yet.
Turning Leaf - Haven't tried yet.
As you can see, without sneak/invisible or even reraise, a few of them seemed undoable. It's very hard to out run bombs and drakes without at least getting hit once. I doubt very few classes can take two without dying.