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Elemental Forums
and no idea what should be correct and if it's working correctly in battle 
They should be additive, i.e. by the time you have the third one, you should be attacking with 75% piercing. I do not know whether that's actually the case, the only character I ever had shadow strike on also had the Champion's lance, so it did not really matter.
Yup they are additive, like all of the other trait upgrades.
It would be nice if they have the little 25% > 50% deal that they implemented in the building list UI.
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