Much like
Malady or
Guinsoo's Rageblade, having more than one will simply accelerate the process of stacking.


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(Copypasted from lolwiki):
Tier Legendary
Stats +200 health
+50 attack damage
+10% cooldown reduction
Unique: +10 armor penetration
Passive Dealing physical damage to an enemy champion reduces their armor by 5% for 4 seconds. This effect stacks up to 5 times.
So the +10 flat Arp is obviously a unique passive, but what about the stacking Arp?
It says that it isn't! And there comes the next question.
If your running X2Cleaver for some crazy reason, would you get to 50% Arp, or it will remain 25% but it will stack twice as fast?
Also I double checked it at the Items sets that are now buld-in to the client just tp be sure, and also I wanted to note that its written diffrently on the Mobafire database(it doesnt clarify if its a unique passive or not).