You know, Fenn, we've never really specified the origin of the Tap - simply that it was shattered during the war with the Forgotten Ones. What's to say the origin of the tap isn't the ash interacting with the vail, the obsidian itself, or the comet, which could be firing off meteorites. If you want to prevent the spread of dangerous magic, then you really could go Fenn v. Volcano. And that's probably something the Order of the Golden Dawn would be all about.

http://www.althanas.com/oldworld/sho...ncient-History

http://www.althanas.com/oldworld/sho...he-Golden-Dawn