Life streamed through him in splendid flood, glad and rampant, until it seemed that it would burst him asunder in sheer ecstasy and pour forth generously over the world.
He was mastered by the sheer surging of life, the tidal wave of being, the perfect joy of each separate muscle, joint, and sinew in that it was everything that was not death, that it was aglow and rampant, expressing itself in movement, flying exultantly under the stars and over the face of dead matter that did not move.
There are no more uses of "rampant" in the book.
Show samples from other sources
First of all, word is that the Flare is running rampant through this whole shuck city and that all kinds of corruption is going on to hide it because the ones who are sick are government bigwigs.
James Dashner -- The Death Cure
It’s become rampant, Eadlyn, and it’s frightening."