Originally Posted by Doombringr
ender can you comment further on armor pen runes vs a high attack speed rune book. you can get ~40% from runes and masteries to start. a free recurve bow at lvl 1 seems very strong to me.
I can see that potentially being stronger on a twitch for example but I am not sure.
At early levels especially, this is very good on Twitch, as you can quickly stack multiple levels of his poison and the expunge, greatly increasing your damage per hit regardless of how much damage your actual attack is doing.
However, if you want the best late-game carry potential, you are going to want Armor Penetration. He already has plenty of buffs to his attackspeed from his ult and stealth, meaning you want to focus on other aspects. Generally this means grabbing Infinity Edge (for damage, crit chance, crit damage) and Last Whisper (for % armor pen, which as stated synergizes very well with flat armor pen), meaning other attackspeed is going to be less effective.