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So the Wave Serpent entry states that it *never rolls more than +1D6* ergo you can never roll more than the original dice +1. The BRB states, *Once a hit has been scored on a vehicle, roll a D6 and add the weapon's strength to it* The + sign in the +1D6 means that you can roll one additional D6 after the first D6 is added.
Also If you count the Vindicare's rifle with the 4d6 penetration Turbo Round and no strength since it completely wipes out the strength bonus from being a sniper it would simply be as put
a 4d6 penetration shot with rending and therefor not having the extra +1d6 do the dice roll since its simply just stating how many you roll and would appear like this (4d6= Armour penetration value)
or if you rend (4d6+d3= Armour penetration value) which still ignores the +1d6 rule, since you are not adding the 4d6 to anything since the strength attribute gets overwritten by the 4d6 and therefore by passing the Energy field's +1d6 special rule.

Three unlocked under the premise that not all discussions in YMDC need to be based on how we actually play the game. Sometimes people enjoy playing around with the wording and nitpicking at GW's grammar. Please bear this in mind and remember that it's an abstract discussion.