it's a lot of work, but maybe ...
A corrupted merchant could be a sound addition you have shards so they can be used to both absorb and give corruption
You have a system in place that increases the chest size further with large amounts of milk,
may I suggest just using that system for new corruption levels?
as always thanks for your work <3
it looks weird if I push it any further than it is now, I'd prefer to draw art for it
Fair enough :0)