Colosso

Colosso is an annual festival held in Tolbi arranged by its lord Babi. This festival is world famous to a degree because of its scope, and central to it is a prestigious tournament of warriors that is often what the name "Colosso" is used to refer to. The competitions Isaac partakes in during Golden Sun, where he fights against Colosso Gladiators, are referred to as the Colosso Finals.

When Isaac and friends arrive at the Tolbi Docks after their trip across the Karagol Sea on the Tolbi-bound Ship, they are told they have arrived too late to enter Colosso. Also, the party learns that Tolbi's ruler, Lord Babi has disappeared. In Altmiller Cave, they discover Babi, and as a reward he lets Isaac enter Colosso. This is also because Babi has an interest in Alchemy, and he hopes to see Isaac use Psynergy during his Colosso bid. Before participating, a guard takes Isaac and his friend on a tour of the Colosso arena. The player gets to see the various obstacles and can also pick from which section of the crowd Garet, Ivan, and Mia will watch. Depending on which section they wait in, the three party members can use their Psynergy to clear obstacles for Isaac or open up alternate paths. Isaac will then face a Colosso warrior. This happens three times, with Azart, Satrage, then Navampa. Isaac may win or lose against the final warrior. The outcome does not differ greatly either way. After the final battle, he will collapse and then wake up in a bed in Babi's palace. If Isaac loses to Azart or Satrage, he will wake up from a "dream" and the player will be able to start the Colosso event over again.

If Isaac manages to beat Navampa, he will receive a Lure Cap as a reward.

During the events of Golden Sun, the participants of that year's Colosso finals are Isaac, Azart, Satrage, Navampa, Galahad, Buford, Morgan and Dekka. Usually, only seven warriors get to the finals, but an exception was made in Isaac's case and he was the eight warrior to participate in the final trials.