By Petterwass, in Dark Heresy Rules Questions

Deamon Hunter mentions the Proven (X) quality when talking about a melee weapon.

I do not remember the Proven quality from any other book, though I could be mistaken. Could anyone enlighten me as to what it does?

New quality from BoM. If you roll less, than X, you roll X instead.

By that, he means that if you roll less than X on your damage dice for the weapon with "Proven (X)", you are instead considered to have rolled X.

It's basically increasing the minimum damage a weapon is capable of and reducing the amount of variation of damage (ie. it'll always do a fair amount of damage, regardless of how good the hit was).

It also is in Daemon Hunter itself, don't know the exact page, but its at the start of the equipment section.