Ar Tonelico takes place on a world that has been destroyed twice, leaving the ground uninhabitable. The sky isn’t much better, leaving people to live in a floating city that surrounds a giant tower that is more or less the only thing that keeps life going. The Tower is split into two areas, the Upper world and Lower world. You are Lyner, a knight who is charged with finding a way to defeat a seemingly indestructible virus.
Gameplay feels much like Gust’s Atelier Iris games. You control Lyner as he explores areas dotted with platform jumping and items that he can interact with, usually by using special magical songs. Ar Tonelico also features a simple to use alchemy process called Grathmeld. After collecting materials on list, you can combine them to create new items. Although you need to stick to the recipe, better materials can be added which can make the resulting item even stronger. Once created, items can be used or converted into crystals, which can then be added to equipment to improve their stats.
During battle, you can have up to four members in your party: three humans and one Reyvateil. Human members act like your standard RPG characters. They can use items, attack and use skills. The Reyvateil, on the other hand, hangs out behind your party. However, their role in battle is more important than the three guys in front.
Reyvateils use song magic, which is just what it sounds like. As the Reyvateil sings, their songs create powerful spells. These are a constant effect and can be changed at any time. The longer the song goes, the more powerful the spell becomes, introducing a few balancing issues. In short, Reyvateils are too powerful. Even at lower levels, their songs do more damage than your other party members can at higher levels. The only limitation is that songs drain magic points, but the damage output is so great that the risk involved with letting songs run isn’t that great.
Reyvateil songs also gain strength based on your other character’s attacks. Whenever your other members hit an enemy, the Ambience of the level increases. Battles begin at zero and can increase up to level three. The higher the level, the more damage songs cause.
Harmonics are another influential aspect of combat. The longer party members and Reyvateils fight in battle together, the more their Harmonic level builds. As this increases, new, more powerful combat abilities are unlocked. Also, at higher levels enemies drop better items. Harmonics are a great idea, but don’t blend well with the combat system. In order for the system to actually be of any use you, need to do as little damage as possible prolonging the battle long enough that the level increases high enough to be useful. All this really does is make battles long and tedious.