Fall of Reach - Mjolnir Upgrade

This suit was spotless and its surface possessed a subtle metallic sheen. He noted the armor plates were slightly thicker, and the black underlayers had a more convoluted weave of components. The fusion pack was half again as large, and tiny luminous slits glowed near the articulation points.

“This is the real MJOLNIR,” Dr. Halsey whispered to him. “What you have been using was only a fraction of what the armor should be. This—” She turned to the Master Chief. “—is everything I had always dreamed it could be. Please put the suit on.”

- Halo: The Fall of Reach, Chapter 27