The idea behind this build - the possibilities of Riven to use as a tank. It's fast, has good dmg at two stuns. A sign that you may escape attenuation and also to help and one Ranged Ulti.

Very Funny to play like a Tank :D

Pros:

+Awesome flexibilty and utility
+Can damage multiple enemies at the same time
+Short stun and also a knockback skill!
+Spammable skills
+Incredible damage
+Great farmer
+Has her own shield skill
+Very nice in both solo lane and with teammates
+Very CC durable
+Very Cute
+Ranged Ulti
+Immortal with this Build

Cons:

-Squishy
-Melee and short range skills
-Can be kited if done correctly
-A champion that easily gets focused
-Won't be doing amazing damage mid-game
-Her stun only lasts for 0.5 seconds
-Lower Dmg with this Build

This is Rivens passive, Runic Blade. If you master her you'll be able to deal tons and tons of damage with this beauty. This is perfect for last hitting minions and tearing down your enemies HP early game.

Rivens bread and butter skill. Broken Wings. You can use this to slice towards your target, dealing AOE damage with every hit. If you hit an enemy with all the 3 combos you're going to deal an amazing amount of damage. This skill can also be used as a miniscule escape mechanism since Riven is actually moving a bit using it.

This skill is exellent for dealing damage around you. Ki Burst can be used for killing minions that would have gone to waste otherwise. You can also unleash this in the middle of a teamfight for a devastating effect. It may only have a 0.5 second duration on the stun effect, but it deals tons of damage and the 0.5 seconds will also restrain your enemies from using any skills at that point.

Ah, Valor! An amazing escape mechanism. Not only do you dash towards your cursor, but you also gain a shield that blocks incoming damage. This will help you in teamfights, in the jungle, 1vs1 and in many other situations. You can escape with this skill as well as hunt using it. I should also mention it's a very nice skill for turret diving.

The source of your damage! When Blade of the Exile is toggled your attack damage will increase by 20%! This will increase the damage you do with skills and normal hits alike. And that's not even the best part! You can activate it again and use it as a ranged spell that pierces through all enemies and minions in your way. The less HP the enemy has, the more damage you do!