Talk:Nasus/@comment-24823977-20141001172327/@comment-6000413-20141003135729

Like all physical damage it is reduced by armor. That's why some people buy penetration on him.

Ex: you have farmed 200 normal minions and you have 100 base AD.

Your lvl 5 Q would deal 810 damage; if you r enemy has 200 armor, he will reduce the damage to 33.33% and take only 270 damage.

To maximize the effectiveness of his Q, damage-wise, you should get some % penetration against heavy armor stackers (say Rammus), flat against squishies, 35-40% CDR and some kind of slow or ms boost.