- After you have obtained the Key of the Eldest Brother from the first merchant, head to this location.
- Just go to this door, you’ll see an E above it. Hurry up and open it!
- Grab the Relic, equip it, and progress.
Note: This does not actually grants you any sort of a Double jump.
but now, wherever there was that red dust floating around, you can see a ledge, and step on it.