Ralkalest

[BitBitio he/him]

So I was rereading the Emperors Soul and I realized that there was an unforgeable metal, ralkalest. Supposedly it was rather weak, and I was like "aluminum!"

So I though about it and I realized that there is at least a decent chance that aluminum is commonly found in the Rose Empire 

[Weltall]

Very good spot. And yes, ralkalest is confirmed to be a local word for aluminum.