ToME: the Tales of Maj'Eyal

The unlocked dual wielding line is the "special attacks" one instead of the "improve basic damage" one
while the bow line the unlocked one is the "improve basic damage" one

So basicly your dagger is there for its bonus effects and not for its dmg? Because if you want to use your dagger properly you need to
a) unlock the line
b) spend 5 points on improved left hand dmg
c) increase a lot your dex...

I was hoping there was a viable-powerful "no dex" build for timewarden but it seems there isnt...

Sure there is. Enough DEX from equipment to 5/5 the important skills and then find Life Drinker.

Who cares about crappy offhand base damage when you have Weapon Folding?

Also, you won't find a powerful no dex build, by looking at using a weapon that requires dex.