Echo location:

- WARD_E33


Here's all the rooms that contain arena unlocks:

- WARF_B28
- WARD_E04
- WARD_R20


Here's every room that contains a lore pearl:

Aether Ridge:

• G04
  
• A09
  
• B14
  
• B33

Heat Ducts:

• I13
  
• H10

Cold Storage:

• E29
  
• R02
  
• R16

Salination:

• F24
  
• F26
  
• J01

The Surface:

• G30
  
• W05