Say you have a lvl10 NON unchained rogue, ninja or just a regular character based on dex with +0 mod yo str.
You use weapon finesse to apply dex to hit, but otherwise have no feat or class feature that adds my dex to damage.
Now, I do have TWF and my main hand weapon has the agile property.
The question is, if I were yo take lethal grace through stalker's talent, how would that modify the damage of each of my weapons?
Would my main weapon remain unaffected beacause im applying dex to dmg through the the agile property of the weapon ?
Would my off hand weapon deal the extra damage from lethal grace (+5) beacause im by default using my str +0 mod to damage?