Jack Schilt (*597 in Port West), a descendant of Jack Schilt the war hero (who had been killed centuries before in the Great War against the Opreju), realizes on his long journey through the vast lands of Gondwana that he plays a key role in the future of his home planet. He is the last Sentry, the ultimate representative of the mysterious species of Gondwana, the Ermeskul. For ages they have been fighting a losing battle against the powerful invader Ar-Nhim Ghaia. Jack Schilt discovers too late that either succeeding or failing his quest means the end of mankind on Gondwana.
Krister Bergmark (*593 in Port West) and Jack Schilt are the main members of the search party that attempts to track down the disappeared Robert Schilt. Fearless and brave, he readily accepts any challenge on their long and dangerous journey through Gondwanaland. He unintentionally discovers the legendary dark realm of the Ar-Nhim, an incident that sets things in motion that have been waiting to happen for ages. On the shores of Lake Taor he is forced to face a devastating truth he is hardly capable to accept.
Luke Eastley (*604 in Van Dien) is Krister's stepbrother and the third member of the search party. The orphan from Van Dien, who constantly struggles with his past is difficult to deal with. He often appears aimless and moody. Yet the dangerous journey through Gondwanaland has an unexpected stabilizing effect on him. His unconditional love towards nature impresses even the Ermeskul, the guardians of Gondwana, who consider the Humans as malicious intruders. During the decisive battle of Crimson Island he makes a dangerous encounter that changes the course of his life.
Avalea (*? in Hyperion), the dark-haired Skiava Jack, Krister and Luke meet in the ruin city of Hyperion, is a woman with many secrets. Her knowledge of the whereabouts of the missing Robert Schilt contributes to the disputable decision to accept her offer and take her along on the exhausting journey to the shores of Lake Taor. Her influence on the search party - especially on Krister - proves to be fateful. Too late do they realize that Avalea's own objectives mean mortal danger.
Robert Schilt jr.
After running aground at Radan in the spring of the year 622, Robert Schilt (*594 in Port West) along with his younger brother Jack stumbles across mysterious records from a time long gone. All of a sudden the strangest things happen. Shortly after that, Robert Schilt disappears without a trace. Trying to track him down, Jack gradually starts wondering if the person he once called his brother ever was related to him. When the last battle starts two brothers are reunited in an epic battle over the future of entire Gondwana.