At the Pouka Pond, you hold the Veil spectrometer. It pulses with Strand energy, but something about it feels off. The vibrations are uneven, out of sync with what's around you.
Perhaps the Shadow Legion tampered with it. Or perhaps you simply need to reset its energetic signature.
Osiris's training program helped you get into the rhythm of using Strand before. A speedy run-through should be enough to align the spectrometer's energy with your unique combat tempo.
Complete Osiris's training program in Radiosonde to retune the spectrometer's Strand vibrations.