Talk:Structure of the Tower/@comment-72.21.245.58-20130123000514/@comment-4736714-20130525005209

The author has stated explicitly on his blog that Irregulars are by definition people from outside the tower. He mentioned it after the revelation of what FUG wanted Baam for -- it's why Baam is able to kill Zahard, because only someone from outside the tower (and therefore unconstrained by his laws) can kill him. Due to a contract with the guardians, anyone born in the tower will not be able to kill Zahard; that's why FUG, who knows that Baam came from the outside, are so interested in him.

It was also explicitly mentioned in Of The Tower's Weapons, where Ashul Edwaru says:  "But for the people outside the Tower, the "Irregulars", it is something they know very well. Surprisingly, there's no Shinsoo in their world, and something called "air" fills their world instead."