The Last Kraken is a boss found in Aglis in disc 4. He guards the first signet of Soa from anyone who dares try to break it and free the body of the Virage Embryo and bring it to earth. When you first encounter this boss, Zeig appears and will talk to you. It seems the Last Kraken is under Zeig's control. That is the sole reason why you must fight it. Luckily, the Last Kraken is the only enemy to kill because Zeig doesn't want to get his hands dirty. After the party defeats the Last Kraken, Zeig will the break the first signet and then fly off.