FATE started going mad - unable to fulfill it's primary function, Lucca and Belthasar saw FATE was becoming obsessed so they took it down but FATE had created a biological interface by rewriting the synapses of a human - in essence downloading it's mind into a biological body. FATE was locked out of the Frozen Flame's research chamber due to the password becoming reset to sync up to the DNA of a boy exposed to the Frozen Flame while FATE was down. FATE was charged with study of the Frozen Flame artifact. FATE would go down during an electromagnetic storm but when it came back up it was locked out by security protocols. Lucca uploaded party member, Robo, as a back-up security A.I. Lucca helped the sage Belthasar develop Chronoplis, a time/space research facility. Lucca appears as a central, if mostly unseen plot element in Chrono Cross. Lucca shows up though, just in time to save Crono, the two focus on finding Marle and unraveling the secrets of time travel.

However Crono is blamed for the kidnapping and becomes a fugitive on the run from the royal guard. In the Middle Ages, Crono attempts to track down Marle finds that the princess, one of her ancestors, as it turns out Marle was the kingdom's princess slumming it at the fair, had been kidnapped and Marle's eventual birth depended on saving her. Crono followed right away to save Marle while Lucca stayed behind to operate the machine and attempt to stabilize the rift until she could control the phenomena. Lucca teleports herself with ease and Crono as well much to the applause of the attending crowd, however when Crono's newly met friend, Marle, stepped on to the teleporter, an unknown catalyst reacted with the machine causing a tear in time, which swallowed up Marle. at the Millennial Fair of Leena's Square, Lucca entered her premier invention, a teleportation device, showing it off to the masses.

Lucca is the childhood friend of the game's protagonist, Crono.

Download lucca chrono trigger