Source: Dragon #346
Through additional effort you can speak another creature's truename with the same ease as your own.
Prerequisite: Truespeak 4 ranks, Skill Focus (Truespeak), must know your own personal truename.
Benefit: You may perform a ritual requiring three days (8 hours per day) and the expenditure of 500 gp x the creature's CR in order to permanently gain a +4 competence bonus on all Truespeak checks to say that creature's name.
Normal: A truenamer has a +4 competence bonus on Truespeak checks made to say his own name.