Besides the Lunar series, Game Arts also worked on the Grandia series. The first game stands out in my mind as a true adventure RPG in the PS1 era. Exploring places is what this game does well. This is a game that also is on PSN, so you don’t have to look high and low for the discs. The dub might not be the greatest, but it is serviceable. (Grandia, PS1/PSN)
Next up: My favorite game for the PS1(and one of the last of the 5th generation.