Ununtrium

Ununtrium is an incredibly rate, indestructible metal bonded to the endoskeletons of Warriors Elite to massively increase their durability.

Fiction

IDW Generation 1 continuity

This section covers fiction that is ongoing. It will be added to as the story progresses. If it isn't current, you can help by updating it.

Ununtrium was bonded to the endoskeletons of Sixshot, Heretech and Black Shadow.

One million years into the Great War, in the Foundry while preparating to infuse Overlord, the Decepticon scientist Rossum noted to Megatron that he thought there was no more ununtrium to be found anywhere, and was concerned that it might be "wasted" on Overlord, who was born on Luna 2 rather than Cybertron itself. Megatron dismissed the concerns, and the metal was successfully infused. Remembrance Day

Notes

• While ununtrium is an actual element - element 113, to be precise - it does not occur in nature, and no isotope has yet been synthesised with a half-life of more than twenty seconds. As no elements heavier than lead (element 82) have known stable isotopes, it's unlikely a non-radioactive isotope exists. [It probably ain't indestructible either.]
• Ununtrium (meaning literally one-one-three-ium) is just its temporary name until the relevant parties agree on who's got dibs on naming. It's the lightest element not yet to have received a permanent name.