Legend of Legaia , commonly abbreviated as LOL, is a Sony PlayStation role-playing game created by Contrail. The game features RPG gameplay, including Japanese character voices and a unique storyline. The game was followed by a 2001 sequel on the PlayStation 2, titled Legaia 2: Duel Saga.

Legend of Legaia's most notable feature is its battle system. The system is conditional turn-based in nature but beyond that lacks resemblance to almost any other game. Instead of simply choosing a spell or attack, the player chooses a combination of moves. (i.e. a left-handed punch, high kick, etc.) Special sequences initiate stronger attacks. In addition, there are no "resting spots": the place a character moves to for their action is where they stay. Also important to the battle system are Seru monsters. Defeating a Seru monster in battle while wearing a Ra-Seru provides a chance that the Ra-Seru will absorb the Seru monster. If this happens, the character wearing that Ra-Seru can summon that Seru to perform a magic attack. As with most magic systems in RPG's, this consumes magic power. In addition, there is a "Spirit" command, in which a character defends for one round and can perform longer attacks during the next turn.