I actually entertained the idea for a master system because I have the foundation for one. The Shamans have two function: the first being you go to the tower and merge with them to transform. The second is you can also "equip" the shamans in your inventory for partial transformations/stat boosts. I don't think it would be too hard to expand on it to the master system.
Viewing post in 5.0 Game Overhaul: In Progress comments
Yeah! And I mean, if you wanted to do like #3 did, there are plenty of named NPC's or special ones that could work as Master's to the party. The leader of the rangers guild, the head mage at the magic school Nina was in. Heck the HR director in the callosum even. He could be like the games Fahl that you unlocked after the whole poison dart debacle was over.