Demise
I remember that these were added in an update.
I can't find it but it was on some previous forum not on this forum
I'm not sure how rare they were made to be on Demise. Since that update I know I have killed many Orc Brutes and have never had 1 drop with over 1300 luck
And yet on OSI with 40 luck........................
....................I used the ingots as a counter 10 ingots equals 1 Brute