Gardens Of Menilesh

The Beginning

This quest starts of in Wai Jhou, where you talk to either Zho Heishan (Hidden Hand, supports Ben Ten), or Lacarra Avanthi (Blood of Truth, supports Nuhmudira).
If you talk to one, the other one will have nothing to do with you. (This is similar to how the Harbinger NPC'S work)

One you decide which faction to support you now head over to The Graveyard. If you do not have the recall spell, a quick way is to run
from Small Black hills near Wai Jhou. To reach Wai Jhou take the Zaikhal portal in Yaraq or via Subway and head to Danby's Outpost
portal at coords: 16.7N X 1.6W. Then head along the beach and take the Desert March portal at: 22.9N X 28.8W. And head down
to the bottom of the dungeon. At the bottom you'll see a bunch of portals to different locations, one of these is the small black hills portal.

Then run to The Graveyard at: 64.1S X 45.4W. You'll be looking for a portal named Gardens of Menilesh at coords: 64.6S X 43.7W.
Enter this portal and you'll be inside a room with Lord Rytheran himself. (Level 200). He'll be surrounded by his Menilesh guards.
Talk to Lord Rytheran and he'll inform you that he is looking for his ring, and that his servants below have gone mad and he needs you to
retrieve it for him. He also informs you that you can attack him, but advises against doing so.

Non-Aggressive Approach

Head to the right side of the area and you'll see a way down. Make sure your group is all buffed up and ready to go, if any one's buffs are lacking.
Fight your way through the Lost Menilesh Denizen's (Undead level 185) until you reach the Pillar Room and stop. Do NOT use this pillar or tons of high level
moarsmen will spawn. The pillar is used for a different quest, so leave it alone on this quest.

Once you get to the Pillar room, head East, East Up The Ramp, South, Then West, & Finally North. The ring is in the middle of the room by the many tree's below.
Head down the ramp and grab the Ring Of Remembrance (13day timer) and head on back to Lord Rytheran and give him the ring.
You'll get Rytheran's Mnemosyne, and a helmet Visage of Menilesh which has Major Life & Major Magic Resistance on it. See picture here
Now had on back to Wai Jhou and talk to the NPC you sided with, Zho Heishan (Hidden Hand) or Lacarra Avanthi (Blood Of Truth) for your XP reward.

Aggressive Approach

In this approach you'll skip right past getting Lord Rytheran's ring and simple start attacking his guards and then the Lord Rytheran himself.
It is a tough battle, so make sure you are prepared with comps, potions, healing kits etc. Undead slayer works very well on Lord Rytheran, especially AR Fire, as does
slash. Once he is defeated, loot his Mnemosyne, and the Visage of Menilesh and head to Wai Jhou for your reward.

Rewards:
I. Visage Of Menilesh (Helmet with Major Life Magic, Major Magic Resistance)
II. XP, around 20% toward your level.

Quick Summary:

Head to Wai Jhou and speak with either Zho Heishan or Lacarra Avanthi to flag for this quest.
Head to The Graveyard and enter the Gardens of Menilesh at coords: 64.6S X 43.7W
Assist or Fight Lord Rytheran to get his Mnemosyne and Visage of Menilesh Helmet.
Head back to Wai Jhou and speak again with Zho Heishan or Lacarra Avanthi for your reward.

Thanks to Destiny Blow for posing in the picture (on the right side of Lord Rythean in the Black/Red Cov Armor) & for help exploring this area.