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If you thought Ochkanatlan is big, it can be even bigger with a hidden underground area. Aside from the huge area, there is a set of puzzle in the cave where after you solve it, you can start a hidden quest called Open Your Heart to Me.
How to Start Open Your Heart to Me Quest
This quest is only available after you complete the whole Lost Traveler in the Ashen Realm Quest Chain. After you're done, go to an opening to a cave southeast of Ochkanatlan.
Inside the cave, go to the west and you can find an opening. Enter that opening and you will find a puzzle.
The puzzle is simple, first, activate the switch so the treasure chest that were submerged in the water will rise.
Then indwell an Iktomisaur and scan the Nighspirit Graffiti on the wall. After that, place the Nightspirit Bodies under the treasure chest, Afterwards, activate the switch once more so the treasure chest will drop on the (Nightspirit Bodies) platform.
Use the Water-Rusted Key inside that treasure chest on the locked gate in this area.
The First Ancient Jadestone Fragment
Keep heading deeper in the cave until you reach a place called 'Where the Ancient Race of Yore Ruled'. There, go to the east side of this area until you see a small dragon statue. Your Saurian will appear to lead you to the key.
Infuse the mechanism with Phlogiston to unlock the gate and you can get the key inside.
Once you're done defeating the enemies, indwell an Iktomisaur and jump on top of the platform before jumping to the opening above. Head to the statue earlier.
Insert the key to the statue to continue with the quest. You need to turn the key to the right angle so it can fit the hole. The solution is:
(1) Tap A once
(2) Insert the Key
After that, you will finally start the quest.
Once the water rise, you can indwell a Koholasaurus and swim to the north. There's a hole there and you need to go inside until you reach the ground. Don't forget to collect the shining item on the way (an item called Ancient Jadestone Fragment).
The Second Ancient Jadestone Fragment
When you reach the ground, defeat the enemy, and use Iktomisaur's skill to scan the Nightspirit Graffiti on the wall.
Then, place the Nightspirit Bodies under the gate so it will turn into a box and open the gate. Go on top of the platform and wait there, the platform will rise upwards.
Topside, you can find another dragon statue. Same as before, you need to insert the key at the right angle to continue the quest. The solution is:
(1) Tap D once
(2) Tap S once
(3) Insert the Key
The water level will drop and you can go down to get another Ancient Jadestone Fragment.
The Third Ancient Jadestone Fragment
Go back to the main area from before and now, swim southward to another opening (that were accessible because the water level drop)
When you see a Phlogiston here, just ram it using Koholasaurus so it will break. Inside it is a mini-puzzle.
What you need to do here is avoid the fire ring that pulsate and jump on top of the platform. The platform will come and go so you need to time your jump (and make sure you have Phlogiston left or your Koholasaurus can't jump).
At the top, switch to Tepetlisaurus so it can break the rocks in the way until you reach the last small dragon statue.
The solution for the last statue is:
(1) Tap S once
(2) Tap D once
(3) Insert the Key
Pick up the last Ancient Jadestone Fragment. After that, approach the huge dragon statue at the center to continue with the quest.
After talking to Ixlel, you need to free it from the binding. Use your Koholasaurus to ram all the Phlogiston blocks. The water will gradually rise so you can reach even the higher one so don't worry.
After that, there's a mini-game where you need to avoid the obstacles until the challenge ends. Finally, the quest will end you will get the achievement [Devoted to Eternal Serenity].