CRIT RUNES?

Pros: Nothing Cons: Everything

Better lategame, harder lasthitting, you can get outtraded, if you don't crit; or if you are against caster like Lucian, Graves, Corki, Ez. Also you can screw CSing by critting the minions. I play with 10 % chance crit runes sometimes.

Pros: If you run 1-2 crit chance runes, you can be cheesy as hell.

Cons: You miss out on AD scalings if you replace AD marks and stuff.

i use a 45% + crit damage bonus in aram and if i get an IE and PD its pretty much gg

First: Crit Damage Runes are absolutely worthless. Armor Pen Runes add more damage to a crit than crit damage runes do.

As for Crit Chance Runes. I think others are betetr, if I want full crit chance I take two PD.

Pros: Taking 1 or 2 crit chance runes can give your autos the ability to crit. Potentially it can change the outcome of a lane with one lucky crit.

Cons: You miss out on a tiny bit of extra AD, so last hitting may be slightly more difficult. The random crit might also mess up your farming rhythm.

Don't really know much about crit damage runes.

I'm also assuming your playing some sort of ADC. I think arpen would be better on somebody like a bruiser.

A lot of people will use a single crit glyph in their builds.

It isn't going to change anything if you take CD or MR glyphs, but it gives you a very small chance.

And a small bonus, statistically, is still bound to happen eventually. And it could shift a fight if you're lucky.

That's the only really viable crit rune build I see.

You could try going full crit reds and such, but 8 to 90% of the time, your runes aren't doing anything for you in that case.

AS, AD and Pen are all consistent and don't rely on chance to be effective.

Critplank is super fun for trolling though.

1 Q takes 3/4 of your lane opponent's health. You'll never see anyone flash faster.