Normally you would use the sealstone Powerless Cap Wrath to get this chest, but you can also do it like it is shown in the video.
Not much use, I must admit, but at least you can open the chests in the next rooms without being forced to get back the Powerless Cap Wrath when you need it the next time (most likely when getting Crescent / Lwyn).

Also photon warps have more style^^

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