Seek Melaverre in the Sanamar Great Hall.

Melaverre tells you, "Ah, I'm glad you came to me. I can see that you have done some dangerous and unorthodox things in the service of our King. I would ask you to do more. In the Obsidian Plains, at 68.4 S, 66.1 W, there is an ancient temple that the Order of the Raven Hand has been using as some site of worship. It is called the Black Spear Temple."
Melaverre tells you, "Within the depths of the temple complex, there is a pedestal which bears the seal of the Elder Spirits that serve the "Living Darkness" the Raven Hand is so infatuated with. The seal is broken, but I have the missing fragment. I would like you to take it and explore the levels that the cultists have not yet been able to penetrate."
Melaverre tells you, "I seek a tablet of ancient knowledge, which has been split into three pieces. The three pieces are guarded by ancient Shadows known as Shonossoar, Kaihoatai, and Parfarrail. Take the fragments from these creatures of Shadow, assemble the tablet, and bring it to me."
Melaverre gives you Elder Spirits Seal Fragment.
Melaverre tells you, "There is one thing for you to remember. I know that there are ways of concealing one's service to the King. Just know that this is a sensitive enough task that there will be no way that your involvement can be forgotten by any simple raid on the Royal Archives. However, if you do this for me, I will grant you full membership in the Ordina Rossu Morta."

Run to the Black Spear Temple Upper Levels (Lvl 100+). Upper level has Raven Hunters, Raven Augurs, and Raven Conscripts. The dungeon layout allows you to encounter them singly or in small groups; however, the re-spawn rate is fast! So, if you find yourself in a long drawn-out battle, it might be better if you ran to the very end.

At the end of the dungeon give your Broken Seal (from Melaverre) to the pillar in the center of the final room. You will then be portalled to the lower levels. (Should you die later you can re-enter the Upper Levels, run to this pillar, and merely touch it to re-enter the lower levels.)

You will now face Shadow Wraiths, Shadow Nightmares, and Void Lords (Lvl 135), a few of which you may meet at the drop! Be careful. Along the way to the first Pit you can kill one of the Void Lords and retrieve a Scroll of Raven Fury.

Finally, at the end of the level you reach a pit. In the bottom is the first high-level Shadow (mentioned by Melaverre). Successive shadow bosses (Lvl 161) are in successive pits. Get a tablet fragment from each, combine the fragments to create the Elder Spirits Tablet.

Oddly, The Elder Spirits Tablet contains the directive "This is to be given to Ecorto the Lost Director". Well, Ecorto the Virindi is in Zaikhal. However, when you attempt to give him the tablet:

Ecorto the Lost Director doesn't know what to do with that.

So, go back to the Sanamar Great Hall and speak to Melaverre.

Melaverre tells you, "So you've picked up the Parfarrail Fragment, have you? Combine it with the other two fragments and give me the complete tablet, if you would be so kind."
You give Melaverre Elder Spirits Tablet.
Melaverre tells you, "A fascinating record of the mysterious Grael. Count Dardante and our King are both very interested. I thank you for your service."
You've earned 9,647,000 experience. [Note. I was a Level 140 Character. - Ed.]
Melaverre gives you Ring of the Rossu Morta.
Melaverre gives you Translated Elder Spirits Tablet.
Melaverre tells you, "You've done some work for me already, haven't you? Sorry, I don't have any more deep pits of eldritch magic to push you into at the moment."

DUNGEON NAME	MAP	RESTRICTIONS
Black Spear Temple (Upper Levels)		Level 100+
Desert March		None