So, I've seen a bunch of different disc recipes, and thought it'd be a good idea to compile them in one place. Like the Final Fantasy Disc that MASSIVELY increases somebody's EXE gain. Here's the instructions for the FF Disc I was given XTR17:
The combination to use is LV1 RPG, LV2 Fantasy, and LV1 Orthodox. The RPG chip is received upon clearing the quest Protagonist Requisites. The Fantasy chip is found in Haneda Mountain Range as a harvest; have the flag up, and have scouts cause a Harvest Shift in this dungeon. The Orthodox chip is found as a treasure in Brandicrash. You will receive a disc that is able to make this combination by reaching Quest Rank A.