How to get here:
You will need to trade a glittering pixie dust (rarely dropped from the top gods) in Elemental Void to gain access.
Once here, if you see an unattended portal without killing anything, that portal takes you back to the start of Elemental Void so be careful and only do that if you really want to go back. It can be a useful option if you kill the bosses in void then come here and quit until the boss here respawns and once you kill it the next time you can use the portal to return to void and kill the bossses there without needing to start from chaos or using more dusts.
In general, this zone is a combination of the mechanics in Elemental Chaos and Elemental Void.
The good news is that you are free to walk about at will.
Going up or down changes the elite level again like it does in Elemental Void.
The zone seems to be split into subsections again like in Elemental Void. Each subsection consists of 3 creatures. 1 wih 1 align, 1 with 2 aligns, and 1 with 3 aligns. Only 1 creature in each subsection drops an armor piece. The armors in this zone give you 10% resist to 3 aligns.
You'll probably want to tweak your rings and armor until you can safely kill something in one of the subsections (which may depend on your available gear) and wait until you get the armor piece in that subsection.
Then you can equip it and hopefully move on to the next subsection to repeat the process with your newly increased resistances. You may still need to adjust your armor and rings after the new armor piece to survive a different subsection since the new subsection has different aligns.
The subsections are layed out such that you start in the center room on one side of the floor. You can walk around the outside bordre of this side and then will lead you to a similar layout on the other side of the floor.
If you kill the mob located in the center room on the opposite side of the floor you started on, you'll get a portal option that will lead to a different subsection.
Like in Elemental Chaos, it seems like if you stay in the starting room for some time you can transition to the next subsection too.
This zone only has a single boss Ashax.
To find it, Navigate to the Grandmaster floor of Murmur Marsh.
From there, go to the opposite side of the floor, kill the mob in the center room, and step through the portal.
After that, walk around the floor a bit and you should see a side room off to itself to the South where the boss lives by itself.
If you get really lucky vs the boss you get an Ashax armor piece which gives you +15% resist to Air, Earth, Fire, and Water. If not that though you just get a random piece that could otherwise be dropped by a creature in the zone.