Can 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.