Item reform takes your equipment and changes them into a newer and stronger variant :
– Changing the refine
– Transform an item to another

You can find more information on it here :
https://hazyforest.com/equipment:item_reform

Demonstration video : https://youtu.be/yUBVfKM0Bhs

Min version for server and client :
PACKETVER_MAIN_NUM >= 20201104
OR PACKETVER_RE_NUM >= 20211103
OR PACKETVER_ZERO_NUM >= 20201118

Reform database is handled with yaml database.
There is also a version provided with ryml