From Halopedia, the Halo wiki
Runic plating is a type of armor plating used by the Swords of Sanghelios. Crafted by Huragoks on Thel 'Vadam's orders, they are lattices of Forerunner composites woven with new energy conduits of unknown purpose. The Shadow of Intent has been outfitted with runic plating during repairs.
- ^ Halo: Warfleet, p. 76-77