In the most recent patch, Evelynn received a most epic of nerfs. She is effectively unusable in the jungle any longer, as her base stats were decreased severely. She has the lowest mana pool in the game, one of the lowest base damages, and a tiny amount of armour. In addition, the duration of her stealth has been reduced (10 seconds instead of 20 at level 1), and her Hate Spike cost has gone over the roof.

Evelynn is still one hell of a champion, capable of causing chaos in ranked games still. The fact that her stealth duration is half of what it previously was at level 1 makes it more difficult to kill an enemy jungler, but is still nonetheless, possible.

Evelynn's origins are shrouded in mystery - a mystery she herself helps to perpetuate. What everyone does know about Evelynn, however, is that she is one of the most skilled assassins in Valoran. It is clear upon first meeting her that she is not quite human. Some theorize that she was cursed with a mild form of fantastical vampirism as a child. Supporters of this theory contend that her ability to sap the very life essence of her opponents on (and off) the Fields of Justice, while still being able to tolerate direct sunlight, would account for this belief. There is some evidence that Evelynn originally came from the Shadow Isles - the mysterious island located northwest of Valoran that is eternally blanketed by a thick, unnatural fog. It is thought that the Shadow Isles are home to countless forms of undead, though no one seems eager to perform the exploration necessary to find out the truth. Evelynn neither confirms nor denies her connection to Shadow Isles.
The power brokers of Valoran know that Evelynn's services come at the highest of premiums, and her recent addition to the League of Legends indicates that her ambitions are growing. Her savagery on the Fields of Justice has been so great that new rumors about her origins are now circulating. The most popular one - an abuse of magic as a child morphed her into the hungering beast her opponents see on the battlefield - always makes her smile when hearing it... an act which bares her razor-sharp fangs and teeth. Evelynn now curries favor from League summoners, gaining influence for reasons known only to her. While the nature of her plans- much like almost everything else about her - remains unknown, there's little doubt that those plans are now set on the world stage.
"There is little mystery about her to me - she is the ultimate predator." - Jax

Since you can no longer jungle, you are forced into the lane right away. Be sure to take a duo lane, as you'll get yourself completely owned in a solo lane, or lose the tower before 10 minutes. Look to try to get your CS around 15 after 5/6 minutes. By then, you should be level 4, and are officially capable of ganking. Immediately look to head to the middle lane. If the bottom lane notices and begins to push, go right back and gank your own lane. Otherwise, you should be able to kill any mid laner, save the fact that they may have flash, or be Vladmir (pool).

If their team has enough squshies, mobility boots are actually quite beneficial for chasedowns. If they've got a couple more tanky characters, rush Sheen but still get the mobility boots early.

Keep Ganking

You've got cleanup duty for teamfights, and you should be able to push turrets pretty well.

Items are really good. Your dps should be pretty mad right about now. Yay for that.

Hate Spike (Active): Instantly spikes the closest enemy unit with malevolent energy, dealing magic damage and 50% damage to a secondary nearby target.
Cooldown: 0.8 seconds
Range: 20
Cost: 12 /15 /18 /21 / 24 mana
Magic Damage: 25 / 40 / 55 / 70 / 85 (+0.28 per ability power)

Shadow Walk (Active): Evelynn fades away, becoming stealthed. Evelynn's next attack or damage ability will stun her target, ending her Shadow Walk. 1.5 sec delay on stealth (delayed further by damage). Evelynn can cast Shadow Walk while stealthed to destealth.
Cost: 60 mana
Range: 200
Stealth Duration: 10 / 20 / 30 / 40 / 50 seconds
Cooldown: 12 / 11 / 10 / 9 / 8 seconds Stun Duration: 1 / 1.25 / 1.5 / 1.75 / 2 seconds

Ravage (Active): Deals magic damage to target unit and it reduces the target's armor and magic resistance for 5 seconds.
Cooldown: 9 seconds
Range: 325
Cost: 90 / 105 / 120 / 135 / 150 mana
Damage Dealt: 80 / 135 / 190 / 255 / 320 (+1 per ability power)
Armor / Resistance Reduced: 10 / 14 / 18 / 22 / 26


Malice and Spite (Passive): Each time Evelynn scores a kill or assist she regains health.
(Active): Evelynn gains attack speed and movement speed for 10 seconds (non-stacking, can cast while stealthed). The cooldown refreshes and Evelynn gains health every time an enemy champion dies.
Cooldown: 90 seconds
Attack Speed: 50 / 75 / 100%
Movement Speed: 20 / 25 / 30%
Health Regained: 350 / 500 / 650

Riot suggests that Evelynn is built as an AP character. This is actually inferior to an AD dps build, but a hybrid build would still give you a pretty decent early game. Rageblade may seem strange to you, but Hate Spike and her really fast Attack speed procs the unique passive on the item. If a hybrid build is really what you want, you could be building same Boots, Rageblade, Lich Bane, Hextech Gunblade, Rylai's Crystal Scepter, and a Black Cleaver.

Stealth generally takes several seconds to achieve depending on the ability that triggers it. Shaco is an exception to this rule, as his Deceive Ability is an instantaneous Stealth, though very short lasting.

Most League of Legends Champions cannot Stealth while under attack, as any damage slows down the actual Stealth's activation. Attacking an enemy breaks Stealth, but most Champions get a bonus for attacking from Stealth.

Stealthed units can be detected indirectly through various abilities that only work when an enemy is nearby. For instance, Katarina's Death Lotus will only activate when an enemy Champion is nearby. This will not take the enemy out of Stealth.

Splash damage, Area of Effect, and Skill Shot Abilities will still damage Stealth units regardless of whether or not they are visible

BEWARE OF LUX, AND ANYONE WITH AN AOE ULT. AN AOE CC TEAM CAN BE VERY SCARY AGAINST EVELYNN