Rheanimum

Rheanimum is a rare gas that is mined on Tykos, a moon of E'brutoc. It improves the density and durability of metals by filling the gaps between molecules, strengthening the material to near-indestructibility. Handy stuff if you're made of metal.

Shattered Glass
Octopunch was given experimental rheanimum rust-proofing to aid in underwater missions, but this had the unexpected side effect of making impervious to nanotech invasion and thus the go-to 'bot for missions against Junkions.