This quest starts off in Zaikhal with the NPC named Jondor
Torgren at 13.6N 0.7E He's off to the side a bit so it's easy to
not spot him at first.

Speak to him to start the flagging process for this quest. If you
do not speak to him, you will not be able to continue with this
quest. The NPC's in Graveyard will tell you to return to Jondor
if you try and skip this part.

Once you've spoken with him, it's now time to head to the
Graveyard. There are three NPC's in the graveyard, each
representing one of the three societies in game. Here's the list:

Celestial Hand NPC

Candrus Steady-Hand at 65.8S, 45.3W

Eldrytch Web NPC

Kousu Temo at 64.2S 44.0W

Radiant Blood NPC

Jawaq ibn Janath at 65.3S 42.3W

If you wish to read more information on what the societies stand for check out the writeup for each one here:

Celestial Hand

Eldrytch Web

Radiant Blood

*Note* You only need to do one of these tasks for the society you
want to join. You do not have to do all three of them.

For example: If you wanted to join the Eldrytch Web, you would
talk to Kousu Temo and do the tasks he asks and then proceed to
Ayan. Again you do not need to do all three tasks if you know
which society you are joining.

Once you've selected which Society your going to support talk to
one of the NPC's above to make your choice, and complete the task
they ask of you, as it will be right in the area they are near.

Once you've finished with their tasks, head on over to Ayan
Baquar and hand in the letter of introductions if you did just
the one task or three letters of introduction if you did all of
them.

Here are the locations of the NPC's in Ayan:

Celestial Hand NPC Joku Shunja at 60.1S 88.0W

Eldrytch Web NPC Qurakh al-Taal at 59.9S 87.9W

Radiant Blood NPC Vierana du Canamorra at 60.0S 87.8W

Once done, head back to Jondor Torgren in Zaikhal and give him
the book or books for XP.

Congratulations, you can now join a Society.