It would use selective breeding, surgical modification, mental training (through induced pain) and technological enhancement to create hundreds of humans with the powers — and disembodiment — of Marc's younger brother Jack.
Marc's increasing ambition draws him to side with a rebel faction of the Concillium — those that do not wish to join 'Unity' with the other races and therefore with the Galactic Mind itself.
One wet night, Denis' favorite daughter, Anne Remillard — a staunch loyalist and advocate of Unity — visits Rogi's bookshop.
Rogi doubts this but when Anne is attacked and nearly killed, he realises that he must inform Jack and Dorothea of the identity of Fury.
He is later realised to have "D-Jumped" — teleported — a first for man and most aliens, although it is revealed in the Saga of the Pliocene Exile that the Shipspouses of Lene had this ability.
Marc, previously totally chaste, falls madly in love with Cyndia Muldowney, the daughter of Rory, an opponent of Paul's, and the two marry.
However, Fury does regain control and tries to kill Rogi physically, since the mental block against using metapsychic powers against parent figures does indeed apply.
During the attack, the rebels accidentally lose control of another explosive device and it explodes, setting off Okanagon's unstable crust.
Jack and Dorothea manage to halt the rebel fleet, thanks to their ability to conjoin the powers of all the pro-Milieu operant humans.
The deaths of the people of Okanagon, however, propel humanity into the state of mental co-ordination (called "coadunation") which is the precursor to a benevolent joining of minds across the galaxy which the member races of the Milieu refer to as Unity.
After the rebel faction is defeated, their leaders flee through a unique one-directional gate in France 6 million years back in time, to the Pliocene period.
He thoroughly repents of his great evil, and becomes the enlightened leader of the same galactic society that starts the intervention, calling himself Atoning Unifex.
Marc, according to the family tree, passes on to the next stage of existence / evolution leaving Rogi to be healed and back in a relationship with Elaine.