UltimaJoe777 wrote: »Mark Target is 1 of several skills that places a debuff on the target. This lowers their Resistances.
Penetration is a stat of yours that lets you ignore that much of an opponent's Resistances.
In your question let's say you have a Gold Sharpened Maul and the opponent has 16k Resistances. Mark Target lowers that while active to 10.8k. Your weapon trait then lets you ignore (not sure what it actually is so let's say 5k) of that so that means your attacks only pay mind to 5.8k of that 10.8k. The passive Heavy Weapons then ignores an additional 20% resistance which if I'm not mistaken applies before the trait (if I'm wrong feel free to correct me on it) and since 20% of 10800 is 2160 you would add 2160 to that 5000 and end up dealing with only 3640 Resistance from the enemy. Of course you can also stack the Champion Passive that increases your Penetration capability onto that to ignore even more.
Hope this info helps you