Another Use For Trial Keys

If you've ever went in and out of a trial chamber, you probably are coming home with a dozen trial keys. Why? Because there are not enough vaults to use all of the keys you get from a trial chamber.

To fix this, you could add a higher-tier vault, (Or whatever you want to call it), with three key slots instead of one. Like the respawn anchor, you'd have to feed it three keys for it to give rewards, while only feeding it one or two keys would play some sort of indicating effect, but not give any rewards. These will have a higher chance for rare items, (i.e. An enchanted golden apple), or new items you can't receive from the original vault.

One last idea is to decrease the chances of a trial key, as they make keys feel common, and repetitive.