[Updated Concept] Silvia, The reaper in the rain (horror champion)
Link to original post: http://boards.na.leagueoflegends.com/en/c/skin-champion-concepts/uVW68VG6-champion-request-silvia-the-reaper-in-the-rain
~~ ~~ COMBAT
Attack range: 170 Resources: only HP, she have no mana
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Passive: Rain of Sorrow: every nearby enemy gets his/her movement speed reduced by 10/12/14% and suffer 4/6/8/10/12/14 (+2% of ability power) magic damage per sec. Range: 260
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Growing Fear [q] Launch a bolt of darkness dealing 100/140/180/220/260 (+70% of ability power) magic damage to first enemy hit and mark him/her for 4 sec. When mark expires, then he/she will be feared for 1,75 sec. In addition, your basic attacks and Behead reduce remaining duration of the mark by 1 sec. Cooldown: 14/13/12/11/10 sec Range: 670 Casting time: 0,2 sec
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Behead [w] Slash with your scythe in front of yourself dealing 50/90/130/170/210 (+85% of attack damage) physical damage to every enemy hit. In addition, enemy minions killed by this ability heals you for 7/11/15/19/23 (+2% of ability power) health per minion killed. Also, your next basic attack within 2 sec gets
130230 bonus range and cause you to jump towards your target into your normal melee range. Cooldown: 5 sec Range: 370
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Mind Crush [e] Passive: your basic attacks does bonus magic damage equal to
2/3/4/5/6% (+1% per 120 AP) of targets missing health1/ 1,5/ 2/ 2,5/ 3% (+1% per 140 ability power) of targets current health.Active: create an illusion of one of allied champions in targeted area. Illusion will move to you and attack nearby enemies. However, illusion deals only 1 point of true damage with its basic attacks, but you can control illusion with this ability. Illusion lasts for 6 sec. Cooldown: 26/24/22/20/18 sec Range: 840
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Reaper in the Rain [r] Increase range of your Rain of Sorrow by 500/550/600. Enemies in the range of it will have their vision range reduced by 30/35/40% and suffers bonus magic damage every sec equal to 2/3/4% of their maximum health. In addition, enemies killed inside the range of this ability heals you for 7% of their maximum health. This effect lasts for 7 sec. Cooldown: 130/110/90 sec
~~ ~~ Some build examples:
AP
AD
Jungle
Sup
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LORE
In the days of the old, there was a castle on a mountain called Heldargal castle. The duke who lived there was fascinated with dark magic and witchcraft. He hired many wizards, dark mages, witches and many other users of dark magic. Nothing good comes out of spells like they used in that castle, so it took away duke's only daughter away. Desperate and blinded be their own foolishness they tried to bring her back. Duke and his dark wizards tried to bring Silvia Heldargal back from the dead using any means necessary. A dark ritual was used and something was truly brought back from the other side. Silvia rose and her heart started to beat again. However, that thing which got back and raised her body from the dead weren't her soul. It was something dark and malevolent. She was lifeless and no happiness was left inside of her. One person died after another, and when almost all people left the castle, duke finally found out why his people are dying. It was the doing of his daughter. One thing is to deal with death of your child, but it is a different matter when you have to kill something who once was your child. Killed and buried, her body was finally at rest. Scars left by dark magic could never be healed and they bleeds out forever. So, even when the body was dead, something was still alive. Something dark, something evil. It kept on killing, kept on haunting. Many years passed, many people visited the ruins of the castle. Whoever visited those ruins was haunted by images of the Silvia. Some died, some managed to ran away and survive. The dark magic used in that place left a mark as a never stopping rain. Runetarra cried in that place for what was done there. However, something changed. Rain started to move. Clouds, wind and rain started to move out of the ruins and out into the world. Something pulled the darkness away from the mountain and into the world. No one knows who is doing that, but now this pale grim ghost is traveling in the world and the rains follows after her whoever she goes.
Friends:
Enemies: 
Game strategy
What is her role?
She is something between mage (not assassin) and bruiser. She is one of those champions who aren't OP, but you still wouldn't want to play against (like
or
). Her main strength is her "oh @%?!, what to do?" aspect, because most of her kit is for playing with enemy's mind. While she wouldn't be a hyper carry, she would still be a terrifying opponent to play against. I would pick her for teams who have global presence on the map (with champions like
+
), so that enemy team would have to be on edges of their seats (even more). Mind tricks are as effective as their user, and she is an effective user.
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Why should she become a champion?
Well, we have not that much champions who can trick enemies (mainly
and
), so having one more would be nice. Also, we have a lot of champions who look scary, but only few champions who are actually scary. In addition, she is an average looking undead female and we have only one champions who is like that (yes,
), so she is pretty unique in her design, lore and theme. Don't forget that we still have no champion with rain theme (
is wind themed), so she would be something new.
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What position fit her best?
Short answer: anywhere where you can terrify enemies. Long answer: her kit is based on surprises and scaring the living hell out of people. She is most effective at pushing enemies out of the line, because of her wave clears and mind tricks. However, she still have pretty normal ganking potential and can turn fights into your teams favor.
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How to use her kit?
Q harass and CC. You have two options: use it on strongest enemy nearby and then fight any other enemy (so that enemy hit with your Q will be feared automatically while you kill other enemies) or use on squishiest target and try to proc fear as fast as you can.
W wave clear and engage on melee champs. Simple as that.
E is a tricky one. You can use this to scary away enemies and pretend that they are getting ganked. You can use this to distract enemies into attacking the clone. You can use this to block skill-shots. There is tons of uses for this ability. You can even tank jungle monsters with this ability and destroy revealed wards faster. I bet most of pro players would find even more uses for this ability.
R is simple all-in engage (or disengage) ability to have more presence in the fight and at same time make enemies to doubt themselves on whether to fight you or not. Bonus damage and vision reduction in 1v1 fights might be a bit lacking, however in team fights it is one of her main strengths: to disrupt enemies and spread terror in them.

would probably be a good built just because of how much of an AoE threat she can be
and
. Her in-game teaser would either be the occasional rain in Summoner's Rift or her whispers echoing through the Fog of War. Also every time someone plays Fiddlesticks, her whispers can be heard; protecting him from enemy champions.