Trial by Earth

Client: Juroro (I-8) Port Bastok
Requirements: Bastok Reputation 6
Items Needed: None
Key Items: Tuning Fork of Earth, Whisper of Tremors
Title: Heir of the Great Earth
Repeatable: Yes, once per real life day
Reward: Ability to summon Titan, or 10000g, or Desert Light, or Earth Belt, or Earth Ring, or Titan's Cudgel
Previous Quest: None
Next Quest: The Moonlit Path, Mama Mia

Walkthrough:

Speak Juroro to receive a Tuning Fork of Earth (key item)Travel to Quicksand Caves and find the Cloister of Tremors.
To do so, go to Eastern Altepa Desert and enter J-7. Once you reach the first room, you want to drop down at the east end of the south wall. Follow that passage until you come to a larger room. Take the passage leading west out of that room. It will take you to another room. Drop down at the south end of the room on the west side. Follow the tunnel to the Cloister of Tremors. Inside the Cloister take the path right at the fork in the road to get to the Earth Protocrystal.
Defeat Titan and acquire the Whisper of Tremors (key item).
Return the Whisper of Tremors to Juroro for your reward.
Alternatively, you can hold onto it and trade to Leepe-Hoppe in Windurst Waters to obtain the Moon Bauble which is key item to enter fight for Fenrir Prime. If you are collecting items for the Evoker's Ring, you will want the Desert Light from Juroro.
Note:
If you have never talked to Juroro before you must talk to her a few times before she gives you the quest.
Everyone who wants to enter the fight must have a Tuning Fork of Earth. There is no cap on this battle.
The time limit is 30-minutes.
You can buff up before entering the protocrystal, as they don't wear off when you enter.
It is important to keep Bar-Stonra up at all times.
It is strongly recommended to fight each avatar on the day it is weak to (Titan on Windsday). Even more strongly recommended NOT to fight the avatar on its day (Titan on Earthday). Spells of each element are much stronger on their specific day of the week.
If you don't have sufficient fame, Juroro will just complain about being hurt a lot.