Lethality: Pre-buff vs Post-buff
lvl:pre-buff(%) post-buff(%)
1 43.3 / 62.2 2 46.6 / 64.4 3 50 / 66.6 4 53.3 / 68.8 5 56.6 / 71.1 6 60 / 73.3 7 63.3 / 75.5 8 66.6 / 77.7 9 70 / 80 10 73.3 / 82.2 11 76.6 / 84.4 12 80 / 86.6 13 83.3 / 88.8 14 86.6 / 91.1 15 90 / 93.3 16 93.3 / 95.5 17 96.6 / 97.7 18 100 / 100
you get your first armor pen item at nearly level 7 or 8 which means that lethality gained nearly 12% in early game, and nearly 5% in mid game (~~level 12)
are the 2 items that i see the most, and combined they give +35 lethality
congratulation! you gained at best 5 armor pen when you have those 2 items, assuming that you're not ahead and have those 2 around level 10 or 11
if you add this item, then it's +50, and you gained nearly +6 armor pen assuming that you have those 3 items quickly because else it's nearly +2.5 armor pen
stop the bandwagon now
. And even then his Q damage can't be amped by crits. So assuming he crits on that attack he's probably going to hit about 500-550.
and
will have negative armor. This means that they will take bonus dmg on top of true dmg.