In Saga Frontier the Battle.ARC file is a compressed version of the Battle.OUT. I have recently learned how to find offsets in Battle.OUT, but I'm not sure how its compressed. The .ARC file is password protected so I was unable to extract it or examine it when I tried to use PeaZip. So instead I tried to compress Battle.OUT and have it in ARC format then importing it into the ISO caused loading any fight caused the game to freeze. I'm reading up on LZSS compression, which is a common type Square used, but was wondering if any pre existing scripts or utilities exist that can do the compression for me.
Below is a link to a Zip Folder containing the Battle.ARC File, an unmodified Battle.OUT file and a modifed BAttle.OUT where the drop rate has been set to 50% for rare drops. I tested the values in the memory so I know they are right. Any help would be useful https://www.dropbox.com/s/lhx1sa5lvncp21d/SF%20BattleArc.7z?dl=0