The Relic of Fate (Chest minigame) is broken or glitched. I have hit the correct button sequence countless times but it shows I've missed it. I'd love to see what this minigame is supposed to do when it works properly!
I use it and it DOES work. You literally only get about 1 second to hit the right button. Usually I have to narrow my decision down to 2 buttons and hope it's one of the two. If you try to account for all 4 and have your thumb in the middle it's pretty tough.
But yeah, it does work in my experience.
I'm pretty good with them. I use them on my Zeus character and have about an 80% win rate. It's extremely easy to refill magic even on the top level of Desert.
If I'm relaxed I usually get them. If I'm frustrated or in a hurry I tend to fail because I end up jumping the gun and pushing the wrong button.