Understandably given the title 'portal' the crew from the old world is sent to another. An even older and familiar world.
They meet the other world's heroes, and our heroes are welcome back to Mianite learning that their home has grown as much as them. The Dianites have a new leader, to Tom's dismay. Mianite has given new light to new creatures - good or bad -, and Ianite has worked hard to restore peace, justice, and balance.
Well there is mostly balance.
Two kingdoms run head to head. One leaning more to the traditional side, and the other wanting a change.
When the New Kingdom of Aura takes the heroes in, they have no choice but to ally themselves with the Kingdom's leaders, Faith and Liberty. They meet Oracles and Elves and learn that their own simplistic home isn't so simple.
They also learn that the other Kingdom may have a more sinister plan, and that they may have an operative on the inside.