Mode Series by Piers Anthony

Colene does not know what to think of the stranger she has rescued. Darius tells her he has traveled from "his reality" to find her. In proving to Colene that other worlds do exist, he uses up the power of the artifact that would allow them to travel back to his universe.They must try a slower, more dangerous method: the creation of a four-dimensional universe. Darius picks five anchor points in five different universes to set up a skew path, a "Virtual Mode," on which the anchors can walk... moreColene does not know what to think of the stranger she has rescued. Darius tells her he has traveled from "his reality" to find her. In proving to Colene that other worlds do exist, he uses up the power of the artifact that would allow them to travel back to his universe.They must try a slower, more dangerous method: the creation of a four-dimensional universe. Darius picks five anchor points in five different universes to set up a skew path, a "Virtual Mode," on which the anchors can walk.Thus begins a tale of romance, danger, adventure, and intrigue as the two travel through a myriad of alternate realities where anything is possible. less

Five special people are the anchor points to a path across parallel universes. There is Darius, of the sympathetic magic…Nona, the ninth child of a ninth child…Seqiro, the telepathic horse…Provos, who remembers only the future…and Colene, the girl from Earth who learned that all dreams are possible.Held captive in Nona's home universe, Colene and her friends must help fulfill a dangerous prophecy—that one day women will take the power of magic away from the cruel men who control it... moreFive special people are the anchor points to a path across parallel universes. There is Darius, of the sympathetic magic…Nona, the ninth child of a ninth child…Seqiro, the telepathic horse…Provos, who remembers only the future…and Colene, the girl from Earth who learned that all dreams are possible.Held captive in Nona's home universe, Colene and her friends must help fulfill a dangerous prophecy—that one day women will take the power of magic away from the cruel men who control it. But first, Nona must cross the barrier to another universe…to that strange and unpredictable place called Earth. less

Accompanied by a king from another planet, a telepathic horse, and a strange, tentacled alien, Colene is heading home to Earth to reunite with her estranged parents--and to put aside her troubled past once and for all.

Beyond the world we know there is a multiverse of Modes where many strange realities interlock in an infinitely intricate pattern, and a perverse and deranged Emperor plays a deadly multidimensional game with human pawns as his slaves.Now, with DoOon Mode, Piers Anthony at last delivers the breathtaking climax to this awesome saga. Fearing the heroine Coleen's dawning power, the depraved Emperor Ddwng dispatches a terrible Mind Monster to assault her soul and bend her to his will... moreBeyond the world we know there is a multiverse of Modes where many strange realities interlock in an infinitely intricate pattern, and a perverse and deranged Emperor plays a deadly multidimensional game with human pawns as his slaves.Now, with DoOon Mode, Piers Anthony at last delivers the breathtaking climax to this awesome saga. Fearing the heroine Coleen's dawning power, the depraved Emperor Ddwng dispatches a terrible Mind Monster to assault her soul and bend her to his will. To protect herself, and those she loves, Coleen must journey back through many worlds to her own home on Earth, face her deepest and darkest fears, and draw the strength for a final confrontation to save the multiverse from tyranny and domination. less