Astius

I can't give you the exact quote, but early in The Bands of Mourning when they're learning about identity, they comment that you would need 2 feruchemical abilities to create a metalmind that was stripped of identity and come to the conclusion that you would need to use hemalurgy or wait for a full feruchemist to be born. The conversation was that it had been a long time but it sounded like there were still some born after the catacendre and that the synod were actively working on getting the right people together to breed a full feruchemist.