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During your journey in Tides of Tomorrow, you learn that there might be a cure for Plastemia, which could help many people. To support the development of this cure, you can go to Ocean Blessing. There, you will find Efod working on experiments with Mereids to help create the cure. You can work with him during your visit.
This is a key part of the game, where you conduct an experiment to create a serum that could make the cure more effective. Here’s how to do it:
How to Enter Ocean Blessing
When approaching the main entrance of Ocean Blessing, you’ll find a gate blocking your way. Tell the guards you were invited by Efod and that you’re there to help cure Plastemia. This should get you inside. If not, you can go to the left and jump over a ramp to gain entry.
Where to Find Efod
Once inside, explore the area and interact with objects around. To advance the story, you need to find Efod. Head up the stone stairs, then take the metal stairs to your right. At the top, you’ll see Efod leaning on a railing. Talk with him to learn that you’ll assist him in his lab, and he will give you the key to enter.
Enter Efod’s Lab
Efod won’t give away the exact location of his lab, so you’ll need to find it yourself. Proceed down the stone staircase and keep moving forward. You’ll see some people with a Mereid and a guard blocking a door—that is the entrance to Efod’s lab. Show the guard the key to be allowed inside.
Accessing the Lab Console
Inside, look for a console with a yellow button on the left. Pressing this button turns on the lights and prompts Efod to come in. Walk upstairs, grab the sedative from the table on the right, put it into the diffuser, and pull the lever to start the experiment. When red lights flash and the alarm sounds, don’t worry—that’s part of the process. Just put another sedative into the diffuser to fix the issue.
Climbing and Collecting Sedatives
Climb the nearby tables onto the next area, then drop into a small space where two more sedatives are located—one in a locker and the other on a table behind some boxes. Collect them to prepare for the next step.
Using the Vision
Use your vision to see which option the Tidewalker chose, then select the one they didn’t pick. Use the wall switch to open the gate, then go back to the diffuser to administer the sedative. This calms the Mereid and completes the experiment.
Optional: Sabotaging the Experiment
If you’re feeling mischievous, you can intentionally choose the wrong sedative to ruin the experiment and harm the Mereid.
Debrief with Efod
After the experiment, Efod heads upstairs with the serum. Follow him. If both you and the previous Tidewalker did good work, the serum will be completed, and Efod will give it to you. This can improve the cure. If you did well, the next Tidewalker might benefit from your efforts, but the serum isn’t ready yet. You can also ask Efod for eggs or Ozen as a reward.
Final Step: Leaving
Near Efod, there’s a yellow button on the wall. After the conversation, you’ll notice it. If you press it, Efod will demand you not to push it. If you do press it, the Mereid will be released, causing the next Tidewalker to restart the experiment and not receive the serum. Efod will also reclaim his reward, but you’ll gain a significant boost to your Pro-Nature trait and be approached by someone waiting by your boat with scrap.
Whether you free the Mereid or not, you must exit through the gate close to Efod. Take the elevator up, use the zipline down to the lower area, and leave Ocean Blessing.





