Use your Stopwatch and the lord should give you a hint. He may say something like "you need a KEY ITEM". That item actually allows you to do double jumps, but it's at another area. Try exploring somewhere else!
Flowchart
Q1. Have shurikens?
Yes: Go find a room with a red rod somewhere in the dark area (like your screenshot).
No: Go clear a mission somewhere in the dark area.
Q2. See a red rod?
Yes: Figure out a way to actually get it. Check your Stopwatch
No: Go to Q1.
Q3. Have the red rod?
Yes: Go find a room with a mural somewhere in the dark area. Figure out its meaning.
No: Go to Q2.
