first, you need to get the golden remain, do it with the unrad trick.
when you have one open it and wait till all items come out, when it finishes load all the rewards don't exit the popup menu but force close the game. when you open the game, the golden remain will still there but your key will decrease and you have gems, totems, all the rewards from the previous open for free
if you still don't understand how to get golden remain with urand trick, basically you just to die with unrad still active and the adventure point (the purple campfire symbol that under day clock) more than 1 point, you cant easily get the early point from finishing the first night or complete table of light 1.
unrad just freeze something in the game that has random elements like drops, fishing, lightning also your remain when you are dead.
the game will reset that randomly every time you open the game, so reset the game if you don't get what you want
just for your information, they are different remain, blank (1 key), gray (3 key), blue (6 key), and golden (9 key). that depends on your luck at least I have to reset 15-20 to get golden remain. when you get lucky and get that golden remain. I advise you to stock up the golden remain for some spare if you accidentally not do the trick