So how powerful might Nameless One Once was?

[wildasses]

So how powerful Nameless One Once was?

as for his most powerful form ever?

[Frattscendent1]

unknown, each incarnation has different control and knowledge of the power of his immortal self. But most likely, the current incarnation you play as in the game is of course. (Since you'll undoubtfully defeat TTO. and so on. Bla bla bla...) Would be odd if the current form would be the weakest and manages to defeat the final boss.

And considering the words: "You shall meet enemies three, but none more powerful than yourself in your full glory...."

[Lantzen]

The thing is that some of the Incarnation probaly haven't serched for his own pass. In some of the flashbacks you get you are leading armys, i don't think those incarnations even cared about finding there trueself. And the current Incarnation is powerful because he stops to forget when he dies, if he would forget his pass as the rest of the Incarnations it would be pretty much gameover in the crypt under the Drowned Nations, so it's probaly true that the current one is one of the most powerful, but thats only because he don't forget his pass anymore like the rest did when they died. Think about how powwerful the calculation and pshyco Incarnation most have been to get that far without dying

[Curry]

Doesn't the last incarnation absorb all the previous ones thus making him the most powerful?

[Frattscendent1]

Doesn't the last incarnation absorb all the previous ones thus making him the most powerful?

Yup. But then again, as curry said he is past i largely unknown. Also in pure force-wise (traditional look on power.) you don't even need to fight TTO. You can will him out of existance for instance (with 23+ wisdom). So there are different perspectives and measures of power.