Hookay, so I'll upload some runs of the 4 new dungeons because I still love this game.
This one here is a solo dungeon. It's pretty straightforward and I didn't bother to dig up any history or story line behind it. I know there were some threads on the main forum about how to pass this but frankly I was so well geared that I blew through it first try without any problems. (so apparently +12 WH gear is OP for this). Anyway, it gives some decent drops and probably takes 20 minutes.
You can skip the 2 guardians and go straight to the final boss but its a huge pain in the ass to fight imo. If you don't save the guardians the tree has them as slaves off to the side and you have about triple the minions to fight and aoe circles to dodge. Also after the crystal is destroyed you must attack the tree itself too. I know there is some "leet" achievement you can get if you do this like 30 times or something but meh.