Buommi Truespeak? Without breaking their vow, I mean. Breaking the vow penalizes skill checks (including Truespeak!), and
the penalties stack, and
there's no way to remove them, and
each time you do adds a whole day to their duration, and
there is no cap. (How'd you like a nice fat -20 to Truespeak?)
The Cha penalty just adds insult to injury.
Anyway, excellent guide, have many cookies.