I know I have seen in one of the 4e books, a magic weapon with a property that if you make a damage roll of 1, 2 or 3, those rolls become a 4. I cannot remember what book I had seen it in or what it was called. Does anyone have any idea what book or the name of it it?
In the end it turns out it was the paragon guild executioner paragon path feature executioner's action.
when you spend an action point to make an attack, and you roll a 1, 2 or 3 on any damage die associated with that attack (including extra damage from assassin's strike or critical hit dice), that die instead deals 4 damage.
I had several books open at the time and somehow ended up thinking that this was a weapon property on a magic weapon.
Thanks for all your help.
The Devastating Ki Focus almost does this, 1 and 2 are counted as 3. It is from page 6 of Dragon Magazine #398 - the Heroes of Shadow section which didn't make it into the Heroes of Shadow supplement book.
There is also the artifact Heartwood Spear, from Dungeon #187 that turns 1 and 2 into 3.
I could not find any weapons or implements that makes 1-3 into 4.