User blog comment:B214/High School DxD DX.4 discussion/@comment-30924344-20170721143331/@comment-1359322-20170722003727

1. Yes it's Mineralization. Didn't read properly.

2. Guan Yu isn't an ancestor of Cao Cao. It only mentions that he has a fate/connection to the original Cao Cao.

3. He was sent by Indra to oversee Cao Cao's team.