X-Men: Road to Onslaught Books in Order

The title tells you the function of the line. Road to Onslaught books are about buildup, not just payoff. They gather the stories that set the emotional and ideological stage for one of the biggest X-Men and Marvel events of the 1990s, when internal strain, psychic damage, and long-running grudges finally become something catastrophic.

That kind of lead-in matters more than people sometimes admit.

Onslaught is not really satisfying if it appears out of nowhere. The X-Men stories that point toward it are full of tension around Xavier, Magneto, trust, trauma, and the accumulating effect of years of conflict. So this kind of page is useful for readers who do not only want the explosion, they want the fuse.

Nicieza's place in 1990s mutant storytelling makes him an important name in that broader period. His X-books often carried the soap-opera momentum and team friction that made the era feel alive.

If you want the bridge material, the stories that make a later event feel earned instead of abrupt, this is the background to keep in mind.