So I had this idea in my head the other day and I was thinking it would give a bit of a deeper meaning towards achieving credos but essentially my idea is simple. Once you have completed a credo, each credo would unlock some specific credo related item that only people with this credo can use;
These are purely examples but here goes for a couple;
Fisherman credo you unlock a special 'Fishermans Rod' which is a fishing rod that only fishermen can use and gives better % on fish.
Strider credo you unlock 'Strider Boots' which has the same effect as bunny slippers but with better gilding chances.
Miner credo you unlock a 'Heavy Mining Support' with extended range over other mine supports.
Blacksmith credo you unlock a 'Blacksmiths Hammer' which increases the speed in which you craft.
Obviously the items would need to be fine tuned to being within reason and not too over tuned but I'm thinking more along the lines of QoL improvements for each item. Feel free to throw out some ideas for other credos too.