Marks:

Greater Mark of Desolation - the only right choice for marks.

Seals:

- Aspd very important parameter, take it.

- 7% critical damage at 18 lvl? Nah. We have

- 3.78% critical chance at 18 lvl, are you kidding me? And we still have and which give us ~60% critical chance.

- ~9 atack dmg at 18 lvl, that's not serious.

Greater Seal of Defense - You are not a tank, so you dont need it!

Seals:

- right choice.

- this runes need for spaming spells. Ashe have only 2 battle spells so she don't need to spam it.

Quintessence:

Greater Quintessence of Desolation - -10 enemy's armor. Yeah, I like it.

- good choice too.

I use 22/0/8 at all AD carrys champions.

As for the masteries I have only one comment.
In the Utility almost all use , this is most useless masterie. Why? Look here. At 18 lvl i have 14.4 HPregen/5sec without this masterie, with this masterie i have ~15.2 HPregen/5sec, + ~0.8 HP regen/5sec - that's ****ty.
That is why your choice -

Start with . If you have a problems with laning, you can buy one more , it will help you.
Then and . More movement speed and damage boost. Finish .

Now tell me - someone from the enemy team is playing for ?

If your answer "No" do not pay attention to this orange comment.

If your answer "yes" then forget about .

very strong champion and if you ignore him, then you're gonna be bad.

Therefore, in this case, I advise you to buy

First purchase , then finish and now finish .


Buy and then finish and .

Explain why you need to buy these items and in that order, I think not necessarily.

This is your core items.

Late game items:

With these items you will raped your opponents as puppies. Build it.

Now you need to think.

If you're feeling fine, have less than 5 deaths in late game and know that you can squeeze more, buy one more , then sell your and buy one more . You are now a little slower, but more deadly.

If it's hard to play, buy one of these items:

If you have problem with mixed damage.

If you have problem with armor.

If you have problem with magic resist.

Now you have everything you need.

My choice
This spells gives to you more survivalabilities. You can easily avoid gank or break into a fight at the right moment, also you can dive.

I never use other spells.

But actually good choice and .

You must know few things about Ashe.

1)Farm - that's all you need. Don't forget about last hits!
2)You are not a tank, but you still can initiate teamfight with your .
3)Your best choice - the bottom lane along with the support like .
4)You have USE IT!
5)Wait for the right moment. Even if the teamfight has already begun, but you still do not see major carrys, continue to wait somewhere in the bushes, and when they come - show them where crabs outwaits winter.
6)Do not forget that your can fly across the map, so you can kill "luckers" who escaped death in teamfight. Just check them and then kill them. If they are very far away, try to shoot an arrow at random, so I did a lot of kills.