My friends have been asking me to post this, so here it is. Im lazy so i dont feel like going too in depth but my build for ashe will make you a beast end game and you can solo anyone end game as well backdoor very quickly and efficiently.

So we pick up Armor Pen Marks for early game to help dps down some of the more tanky type champions you possibly could be laning against.

The Mana Regen Seals, so that you can spam volley much more often which is vital for keeping enemy teams at bay end game, and skill shotting enemies through jungle who may be trying to get away from you.

The Cooldown Reduction Glyphs again to help with spammage, but this time for your ultimate. Ashes ultimate is critical throughout the game and can not only give yourself of allies an easy kill from anywhere on the map but also save them from being chased down. Its vital to reduce this CD as much as possible without sacrificing killing power.

NOMNOM Armor pen!

So i wasnt sure exactly per level what to get but basically a rundown of how I do it.
Max volley first as its your main spam skill and incredibly effective.

Get your frost arrow to about 3-4 then start putting more points into hawkshot.

Hawkshot is an invaluable ability for not only yourself but your team as well. Its very useful for checking for approaching champs when your attacking a turret, or farming out by yourself end game. It can also be the saving grace for your team by revealing a deadly ambush the enemy team may be setting. Always use hawkshot to recon for your team if your together and going through the jungle with all MIA or to check barron late game.

So while it may seem a bit unorthodox this item build is actually quite efficient early, mid and end game.

Two dorans blades to start to give you alot more survivability early game and deceives people into thinking they can take down squishy ashe with ease but end up regretting it later. It also gives you sufficient life steal making laning that much easier with some AD to top it off.

Then we get movement speed boots because its your job not only as the carry but a good source of CC to slow down champs and to do this we need to be fast.

After that, get the Black Cleaver, this item is very much unappreciated for its incredible amount of armor pen, AD, and AS all essential for ashe and with this one item alone substantially increases ashe's ganking power early-mid game.

Then we'll get Phantom Dancer for its incredible AS, Crit, and movement speed increasing again gank, and a little more movement speed.

Last Whisperer, to give you a great amount of Armor Pen against some champs who may be stacking armor. I dont think its enough to just have flat bonuses to armor pen. With LW you get 40% armor pen so no matter their build you should be doing quite alot of damage to just about anyone. As well as a nice 40 additional AD.

Late game you should have Infinity Edge, and heres were ashe takes off and dwarves any carry ive played with. You should be criting pretty often for about 600-800 damage with 1.7-1.8 attack speed.(sell a dorans blade)

Finally get Blood thirster, as it gives insane amount of AD and a nice amount of life steal especially since your criting with practically every hit the life steal is usually 100 hp a shot minimum. With this your now criting for about 700-900 damage against any champion sometimes more if theyre really squishy.

I usually roll with flash and teleport. Flash is great for jumping in and out of combat situations or making that jump across jungle and terrain to save an ally or escape a gank. Teleport for just about the same reasons as flash for maybe ganking a low champion across the map, saving an ally, or possibly Backdooring late game if need be.

All in all, I think this is a great build and its won me many games as the deadliest carry on my team every time. I hope you enjoy the build and sorry for being short and concise. Any questions feel free to ask.