@X-Codes
Actually, I would say that with cheese, Truenamer works out ok. The utterances are similar in power as Warlock invocations (barring a few exceptions like Gate), and his main offense, Greater Word of Nurturing, maxes out at about 30d6 single target damage. (Mind you, that's already mortalbane'd and empowered). With Rebuild Item use, he becomes much stronger, especially if all kinds of sources are allowed. But how much stronger depends on which interpretation for the Laws of Sequence and Resistance you follow. If you take RAW, it's a large boost, if you take the rules the way the example intends them to work, it's only medium size.
Overall, I would say that a completely cheesed Truenamer (Polymorph to Garbler) breaks the game, because he can deal arbitrarily large damage, no save, no SR, to anything.
A strongly cheesed Truenamer works out somewhere between Tier 2 and 3, so he's ok to play in game.
@TML
You really, really need concealment though, if you use that trick. It lowers your AC by the same amount, so even a commoner 1 with STR 1 will hit you 95% of the time if you don't have it.
@Beholderslayer/CantripN
It is the Paragnostic Assembly, correct.
If you take Leadership, you might also consider an Artificer cohort, because he can create lots of +Truespeak stuff you need, and has access to the Skill Enhancement infusion and the infusion that changes bonus types of items. Using that a lot, you can reach the same levels you would with an Item Familiar (If your DM accepts Dodge Boni to Truespeak, that is
)