Breaker alloy

Breaker alloy is, obviously, an Alloy. What you may not have known is that the "Breaker" in breaker alloy means "Eternal Breaker". This alloy is the bane of an eternal's existence, burning an eternals bare skin and flesh when in contact. It is never been known why this metal is the absolute destroyer of eternal flesh, but it is better to not wonder and use it to kill any eternal dumb enough to not step out of the way when being rushed with a knife made out of the stuff.

The metal is shiny silver, with an iridescent effect in sunlight. It's appearance is clearly burned into the minds, (and in some cases, flesh) of any and all eternals

Humans have used it to kill eternals for centuries, which is why the Divide occurred, (an event where 75% of all eternals left earth, while only the very brave, or very foolish, remained) Prolonged exposure to human flesh does tend to cause chemical burns when in contact with human sweat or blood. It has never been known why this occurs either.

Breaker alloy can be mixed with Titanium to form Darkmetal, a marginally safer and cheaper alternative to Breaker alloy.

Breaker alloy tends to interrupt an Eternals energy flow, causing their blood to turn a normal red color. The energy interruption is one of the reasons why it's so deadly, as it can cause serious problems down the road, including core failure or even Core Overload.