User blog comment:B214/Shin DxD 1 discussion/@comment-32252462-20181123175758/@comment-33359929-20181123202437

There's absolutely nothing else that we know about the sage other than that he was arrested by Angels and taken away. Ergo he's either in Second Heaven or in some prison at the Church somewhere. There's nothing we know about the Philosopher's Stone apart from the fact that the sage was close to creating it. Not one mention. Anywhere. Deal with it.