One of the ideas me and my friends came up with was if you get higher then the target number by a certain amount then X happens. I do t know the card shopkeepers daughter off hand but here is an example.
Wisdom/Charisma 8 check to defeat
What ever text there is if you fail here( sorry I don't remember off hand)
Threshold 15+ banish this barrier, Then summon and encounter the barrier large chest.
Or you can use something like this instead
If a boon with the ring trait was used to defeat this barrier, banish this barrier then summon and encounter the barrier large chest.
I hope these ideas help.
