Riven is an exiled champ shes manaless has great attack and u want to build her pure attack damage. She can be a god on the battle field if played right. You can use her moves to eat ur enemy. She is an all around great champion. She might not be the fastest but if u can get close to someone they are dead. Well pls leave a comment and tell how i can improve my guide thx :)

Here is the order for the build

Boots , 3 health potions
Dorans blade
B.F. Sword , vampiric scepter
Giant's Belt
Mercury Threads
Blood Thirster
Warmong's Armor
Infinity Edge
Atma's Impaler

Pros
1. She is manaless
2. she has a stun and a shield
3. shes pure attack

Cons
1.Needs proper timing on her skills to be effective
2.Cooldown dependent
3.A bad start is hard to recover from
4.Shut down hard by CC

Ok so its really simple to farm with this champ all you have to do is use ur Q and the minion wave will be gone. Its easy to out far anyone ur laning against.

Moves:

[Passive] - Runic Blade: This is by far Riven's most complex ability. Every time Riven uses a skill, she charges her next Auto Attack to deal extra damage, plus her bonus physical damage. Used correctly , this is the skill that makes Riven what she is.
(This is also the main reason I take AD runes over armor pen.)

[Q] - Broken Wings: This is Riven's main Damage-Dealing skill. When activated, Riven dashes forward a short distance, and swings her blade, dealing damage to all monsters and champions in front of her. This can be activated up to three times in succession, the third time slamming the ground, and knocking all enemies near the point of impact away.
(This is the other reason)

[W] - Ki Burst: This is Riven's second disable. When activated, Ki Burst deals damage in a radius, and stuns all targets hit for a (very) short time. This can be useful in many situations, and can also aid you in landing empowered Auto Attacks on enemies.

[E] - Valor: This is Riven's second Movement Ability, as well as her defensive ability. When activated, Riven dashes forward and gains a Shield (That scales with bouns AD). This ability can be used to block incoming Turret hits, as well as any unwanted cheap shots. It is also good for escaping skills like Swain's Nevermove, and Viegar's Event Horizon.

[R] - Blade of the Exile: This is Riven's ultimate, upon activation, Riven gains bonus AD and Range on all of her attacks, this also enables the use of Wind Slash.

[Secondary R] - Wind Slash: This is Riven's most powerful attack, and by far most deadly skill. Once Riven has used Blade of the Exile, she can activate Wind Slash at any time during it's duration. Riven shoots three projectiles in a cone in front of her, dealing damage based on her AD and the amount of health an opponent is missing. Wind Slash is very good when used on multiple targets, and when attempting to pick up kills. Using Wind Slash does NOT end the duration of Blade of the Exile, so you will still have your bonus range and damage even after using it.

Greater Mark of Strength - These will give you a good early game boost, and with the ArPen masteries and strong scaling on Riven's skills, these are the strongest choice.

Greater Seal of Resilience - Standard runes. These will help keep you alive early before your Valor shell really kicks in. Armor seals give you the early game defense until you've leveled up Valor enough. Scaling armor seals or HP seals can both serve as suitable replacements, if you prefer.

Greater Glyph of Shielding - Scaling MR. Equal benefit at around level 6, I believe. These make an excellent substitute for your CDR glyphs. These are generally better than flat MR, unless you are laning against a magic dealer top. Even then, these are probably still better than flat. Your call.

Greater Quintessence of Strength - Once again, Riven's scaling makes these the best choice. The same rules of the marks apply to the quints.

Well thts all i have to say about her all around i would say she is a monster. Build her right and the enemy is done for. and remember dont tower dive till u get a giants belt( still dangerous) or a warmongs (SAFE)