| Name | Description |
| Differences in Hollow Activity | The pressure bar of the HDD indicates the current pressure level Agents are experiencing in the Hollow. Ether activity varies across different Hollows, and Agents operating in Hollows with a higher level of Ether activity will encounter more intense pressure. |
| Differences in Hollow Activity | Hollow activity level is low, and Pressure will not increase. The designated area for the commission is currently experiencing a low level of activity within the Hollow. The Corruption of Etheric Matter is low and will not increase Pressure. |
| Differences in Hollow Activity | Hollow activity level is moderate, and Pressure will increase in certain areas. The designated area for the commission is currently experiencing a moderate level of activity within the Hollow. The Corruption of Etheric Matter is manageable, but there will be a moderate increase in Pressure. |
| Differences in Hollow Activity | Hollow activity level is high, and Pressure will increase in all areas. The designated area for the commission is currently experiencing a high level of activity within the Hollow. The Corruption of Etheric Matter is severe, and there will be a tremendous increase in Pressure. |
| Hollow Zero | Hollow Zero, also known as “Limbo,” is a colossal Hollow that consumed the old Eridu, resulting in its destruction, and serves as the source of several massive Hollows in and around New Eridu. The investigation and neutralization of Hollow Zero pose a long-term challenge for the authorities of New Eridu, both presently and in the future. |
| Hollow Zero | The Hollow Investigative Association will regularly issue commissions to investigate Hollow Zero and give rewards to those who complete the commissions. |
| Hollow Zero | Once you’ve explored the Core area, you can choose to continue your exploration into Withering Garden and challenge more powerful enemies for more lucrative rewards. |
| Basic Movement | {LAYOUT_MOBILE#Tap the monitors to move around. Drag the screen to adjust the camera. Pinch with two fingers to zoom in and out. Upon selecting a distant location, the HDD system will automatically find an accessible path and guide Eous to move there.}{LAYOUT_KEYBOARD#Use Hold  to drag and adjust the camera. Scroll  to zoom in and out.Upon selecting a distant location, the HDD system will automatically find an accessible path and guide Eous to move there.}{LAYOUT_CONTROLLER#Drag  or press Drag  to adjust the camera. Use or press to adjust the camera. Use |
| Observation Data | Scattered throughout the Hollows, you’ll find crucial materials known as “Observation Data.” Each commissioned Hollow contains 3 sets of Observation Data. Collecting these data sets increases the final rating of your commission and rewards you with additional Polychromes. |
| Observation Data | Observation data in the Hollow will be saved once picked up. You don’t need to pick it up again when exploring the same area. |
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