If there is no guard protecting the passage, including if the guard has been moved, it is permissible to freely move from one spawn point to another.
Are a spawn point and a territory the same thing?
In the game, I took empty Pandora boxes as a main hero (there was no Wisdom skill, but there was a book), and after a couple of turns, Solmyr attacked the opponent's main hero and hit him with Chain Lightning. I don't know if the Pandora boxes gave the entire 4th level or the entire 5th level, but not using a good opportunity to deplete the opponent's resources is also, in my opinion, a crime against strong play.
Charity suffereth long, and is kind; charity envieth not; charity vaunteth not itself, is not puffed up,
Doth not behave itself unseemly, seeketh not her own, is not easily provoked, thinketh no evil;
Rejoiceth not in iniquity, but rejoiceth in the truth;
Beareth all things, believeth all things, hopeth all things, endureth all things. Charity never faileth...