What does a fast yellow blinking light on my back mean?

[Astro]

What does a fast yellow blinking light on my back mean?

[Gyson]

It means you're near an invisible chest (a type of deviant). If you locate and defeat it you can loot the chest.

Snap your fingers to reveal it once you think you're close enough. The faster the light blinks, the closer you are.

[Astro]

gotcha thanks