This is a Dominion guide for full damage riven. It is advised to use this guide only if there is a tank on the team and you are not required to build tanky. Riven is one of my favorite champs to play on dominion and have been using this build for quite some time now. I hope you guys find it useful. If you have any recommendations or constructive criticism please comment.

HP Quints for durability (Since you will be building all damage)
Armor Pen Marks
Dodge OR Armor seals for extra durability
CDR Glyphs for constant use of abilities

21/9/0
-Spec for cooldown reduction, not attack speed (She doesn't need it, the majority of her damage comes from her abilities and passive)
-In defense spec for health, armor and magic resist. (more durability)

Start off with prospectors blade, level 1 boots, and 2 health pots.
When you go back to buy if u have enough, build a BF, otherwise start building the brutalizer. The cooldown reduction from this item is extremely important along with the armor penetration.
Build Sanguine asap. Remember to auto-attack between abilities in order to keep stacks on sanguine and to make use of her passive.
Then buy Infinity Edge and Entropy for lots of crit and AD.
If your game lasts this long (which it shouldn't) you can buy atmas or frozen mallet.

Max R>Q>W>E

Runic Blade (Passive): Remember to take full advantage of Riven's passive. It is important to auto-attack after each cast (if possible) to make sure that you do not lose your passive attack bonus.
Broken Wings (Q): In a team fight be sure to hit as many targets as possible with each cast of broken wings. Using your ult before you cast your spells will give you a larger range on each cast and increased damage.
Ki Burst (W): Make sure to be very close to an enemy when using this, it has a very small range. However, when your ult is active, the range is increased along with the damage.
Valor (E): Great way to get into or out of a fight quickly, while also providing yourself with a nice shield. This scales really well with AD, which is why Riven has good defense even without defensive items.
Blade of the Exile (R): This ult can be extremely powerful. Make sure to activate it right as you enter a team fight. Cast Wind Slash once you notice your opponents getting low on hp or trying to escape. Remember it does more damage the more hurt they are.

I find ghost/exhaust most useful for Riven. Her abilities allow her to chase/run away extremely well. With these spells you'll have great mobility and easy kills.
Alternates: I would recommend always using ghost because it is important to have good mobility on this map. However, exhaust can be interchangeable with ignite or even garrison. With garrison, you should be able to hold 2-3 people off of your capture point by yourself.