Final Fantasy X/Area Conquest

The area conquest creations are unlocked by collecting one of each fiend in its respective area. They are the easiest creations you will find in the monster arena, but if you already tried to fight Chimerageist you'll realise they're still a lot more powerful than anything on the main storyline.

Each of the below fiends will cost 6000 gil to fight with the exception of Don Tonberry which costs 8000 gil. As you might expect as you go down the list each creation in general is harder, apart from Chimerageist who is the easiest monster arena creation (as he is the first one you must unlock).