Can someone explain the true namer class, especially when they speak an utterance do they have to make a Truespeak check, and what exactly is a reversal, and how do they do that
Okay, there is a lot.
Truenamers have tapped into Truespeak: These are words of creation. The very fabric of reality was constructed by them in the beginning.
Reality auto-made their check I guess.
Utterrances are specific phrases that bring about a specific things. A Reverseal is the reverse meaning of the word. Almost any Utterance has one. However, they count as the same word for Law of Resistance.
Now this sounds pretty awesome, but the check isn't so easy unless you focus on it (buy Int items, max ranks, buy + skill bonus items, etc).
To affect someone you must roll Truespeak check DC 15 + CR x2 (if enemy) or HD x2 (if ally or PC).
You are your own ally, but you are harder to affect so +2 DC, but you know your own truename very well so you get +4 Truespeak to say your name (+2-4= -2 DC overall).
The Law of Resistance is realitys fight against changing (so successfuly use an utterance means -2 penalty to use it again each time).
The Law of resistance is used instead of spells/day balancing metheod.
Reality hears you even when silenced because reality has awesome hearing.
They have Bardic casting progression (ending with 6th level Evolving Mind utterances ar level 20). You also get object and landscape utterances.
Example, Smidul the Truenamer, is level 3 with 16 Int and skill focus: Truespeak. Max Ranks of 6 of Truespeak.
He sees a Ogre (CR 3) and wants to use on it Inertia Surge-Reversal version (Reality will keep it from moving from that spot). It only lasts 1 rd, but it keeps the Wizard from being charged.
There is no save (some utterances have saves and a check required), but the DC is 15 + (3)x2 =21.
He needs a 9 or better (If he succeeds the DC goes up by 2 from Law of Resistances). Had he took the feat Extend Utterance the utterance would lasst 1 rd more but the DC +5.
At low levels the DC isn't too bad, but the check becomes increasingly harder.
Let us look at Smidul at level 10. He now has 18 Int (+4 Int Item) so 22 Int. Max ranks mean 13 ranks. Skill focus: Truespeak of course still. Truenaming necklace +10 (costs 10K gold but worth it). Bonus = 29.
The party fights a Mature adult White Dragon (CR 12). DC to affect minimum 15 + 24= 39.
So affecting it means 50% chance you'll succeed the first time (then it becomes harder).