Possible erratum in COVENANTS

I may be being stupid but when I look at the Major External Relations Boon Autochephalous (p20 of COVENANTS) it says:

"A covenant with the Isolated Boon need not take this one."

And I can't find an Isolated Boon anywhere.

There's Secluded but that's a minor boon and doesn't seem to cover quite the same thing as Autochephalous.