Remnant 2 is filled with all sorts of interesting locations. The Lament, for instance, is a dungeon in the Yaesha world. It's filled with plenty of traps, enemies, and valuables. That last one is obviously better than the others. However, most of the valuables are locked behind puzzles. One of the said puzzles contains a bunch of platforms with symbols on them. You need to get past them to reach the goodies.
The whole thing looks like something you would jump across in a platformer. In fact, your initial instinct might be to leap to each one. Yet, the jumping in Remnant 2 is designed to get over small gaps - not jump on small platforms. As such, you have to be very lucky to get across that way. Thankfully, there is a proper way to get past them.
How To Get The Kolket's Key
Before you even attempt to complete the platform puzzle, you need to make sure you have the Kolket's Razor, which can become the Kolket's Key. This is because this item allows you to open the door on the other side of the platforms.
To get the Kolket's Razor, you must kill a dangerous creature that you find after completing the dial puzzle, which is also in The Lament area.
When you have the item, go into your inventory and inspect it. Rotate the thing until you find a button to press that turns the razor into a key.
How To Complete The Platform Puzzle
Despite looking like a platforming section, no jumping is actually needed to get across to the other side. This is because there are invisible bridges between some of the platforms.
From the starting point, shoot at the gap between you and one of the three platforms in front of you. If the bullet doesn't get stopped, then the invisible bridge isn't there. So, try the same method on the next two platforms.
It can sometimes be hard to tell if the bullet gets stopped. So, you may need to fire several shots to make sure.
One of them should have an invisible bridge leading to it. Because of the randomized nature of Remnant 2, the bridge's location isn't the same for everybody.
Once you find the invisible bridge, walk across it. You need to be careful, as the bridges seem to be very thin and as you can't see the edge, it's easy to fall off.
When you get to the first platform, take a look at the symbol on top. Then look for the next platform with the same symbol. There will be an invisible bridge between them that allows you to progress. Continue doing this until you reach the other side.
From there, open the door with the Kolket's Key and collect all the valuables inside the room it unlocks.