In the previous part you turned the ovens on. After four hours, the ovens will have finished. So let's go back there. Select the Er'cana linking book from your Relto bookshelf and use the shell cloth to link to the back side of the facility. Turn left and walk towards the room with the orange glow and the cylindrical device in the middle.
This time, the large button above the pedestal is lit up. Touch it and the cylindrical device starts pumping and making a lot of noise, then the device opens. Five huge brown pills appear. These are called pellets. But what are they for? When the cylindrical device (which I will refer to as pellet machine from now on) opened, a blue button appeared on top of the pedestal. Touch the blue button and one of the pellets rolls down into the dispenser on top of the pedestal. Touch the pellet in the dispenser, then touch the linking book on your right. You are linked to the Er'cana City Silo where the pellet is put in a machine that seems to measure something, then the pellet is dropped into the water below. Watch the cutscene as the entire room is illuminated while the pellet dissolves in the water.
What you've learned so far is that the pellets can lighten up the room when they are dropped in the water. So what do you need that for? Remember the special Bahro cave with another cave underneath it? The lower cave had a pool of water in the middle. So maybe you need to drop one of these pellets in the special Bahro cave. There is one problem however, although you know that there is another cave underneath the one that you have been to earlier, you have no way to get to the other cave yet. For that, you need to finish Ahnonay first.
* End of Part 3 * Next: Er'cana Part 4: Back to where it all started