Every Force starts out with this simple yet powerful technique. At higher levels, it travels faster and becomes quicker to cast, making it useful even late in the game
Gifoie is great in the caves, where most enemies are weak to fire. It's a little too slow to use in later areas, though, and should be replaced with Rafoie and Razonde.
Rafoie has slightly finicky targeting and range, but does a ton of damage and can easily wipe out a group of enimies. It's great on bosses too.
Barta can cut through enimies to hit the ones behind it. Thats a neat at low levels, but most players will retire this spell when they get Gibarta, which does the same thing better.
Gibarta is possibly the most useful ice spell. It's relatively cheap, it can hit multipul enemies, its great aginst the dragon, and it frequently freezes enemies. Oh-yeah!
Rabarta hits every foe near you. Its high probability of freezing enemies is very nice, but it has fairly limited range. Fortunatly, that gets better in range at higher levels.