Fiddlesticks is a medium ranged mage; adept at crowd control, area of effect damage, and jungling.
My runes are Magic Penetration Marks, Ability Power per Level Seals and Glyphs, and Flat Ability Power Quintessences.
My Masteries are 21/0/9. Taking all of the Magic Damage buffs and improved Summoner Spells in offense, and Respawn Reduction, Mana, Mana Regen, Movement Speed, and increased Neutral Buff Duration in Utility.
For Summoner Spells i recommend Ignite in classic, Ghost in Dominion, and Flash in both game types.
Creeping / Jungling (Page 2)
When jungling, your goal is to get level 6 as soon as possible, to gank with Crowstorm.
Adjust your Masteries for Improved Flash/Smite (Player's Choice) and Improved Recall.
Take Drain at level 1, maxing right away, Dark Wind at level 2, maxing last, and Terrify at level 3, maxing second.
Swap Sorcerer's Shoes, Abyssal Scepter, and Will of the Ancients for Ionian Boots of Lucidity, Void Staff, and Rylai's Crystal Scepter
Start at the
and have a teammate pull the Golem for some free damage. Failing that, simply move around the camp in-between Drain cool-downs, taking it down with Smite.
Fiddlesticks is an exceptional
threat. Upon reaching level 6 or higher buy a Vision Ward and a Sight Ward. Place the Vision Ward near Dragon to check for enemy wards, and place the Sight Ward at the blue team's Jungle-River entrance above Dragon's cave to watch for enemy ganks. Then call your teammates over and tank the Dragon with your Drain. Make sure you check how much damage your Smite will do, to ensure you get the killing blow. At higher levels of Drain and with some Ability power, Fiddlesticks can solo the Dragon, even without Blue buff. To do this, it's typically safer to Drain the Dragon from the back of his cave. If you see your enemies coming to gank, just flash backwards over the wall.
Fiddlesticks is also exceptional at tanking
. For this, you'll typically want to take the Blue buff and walk into melee range as you'll be able to heal all of his damage, and ignore his debuffs.
Dominion (Page 3)
Since you start at level 3 with 3 skill points available in Domnion, i take two points in Drain and one point in Dark Wind, taking a point in Terrify at level 4.
My masteries for Dominion are pretty much the same as Laning in Classic. Just adjust your Utility masteries for max Respawn reduction and take 3 points in Movement Speed.
My runes also don't change much. Again, because you start at level 3 and passively gain experience, you'll want to take three Ability Power per Level Quintessesences over the three Flat Abiltiy Power Quintessesences in Classic.
I go for a Cool-Down Reduction centric build here, giving me as frequent use of my abilities as possible. Open with an Amplifying Tome, Meki Pendant, and Boots of Speed. Upgrade immediately to Ionian Boots of Lucidity and pick up a Morello's Evil Tome for max Cool-Down Reduction. I then complete my build with Rabadon's Deathcap, Zhonya's Hourglass, Will of the Ancients, and Abyssal Scepter.
Fiddlesticks is extremely dominant in Early-Game Dominion. Whenever you see an opponent, just cast Dark Wind, Terrify, and Drain in Sequence. This will allow you to push your opponent away and run into the minion wave to pick up some free farm.
Counters to Fiddlesticks
Even with the element of surprise, some champions are amazing counters to Fiddlesticks. Assassins in general tend to out-range most of Fiddlesticks' abilities. However, Akali, LeBlanc, Diana, and Fizz are the most potent threats in this class, as they can disrupt him with either status effects or extremely high burst damage.
The best way to counter these champions is too block there Line Of Sight. Hide in a bush if possible and only reveal your self long enough to briefly harass them until you can pick up the kill. This makes Fiddlesticks extremely hard to beat if he's the Solo Top on Twisted Treeline as there are two bushes in the lane and he can hide in Dragon's cave, effectively blocking Line Of Sight for the enemy and maintaining his Sight on them thanks to the Minion Wave.
Also, be wary of champions that can "move" opposing champions around. Moving Fiddlesticks after he's started his Drain will break the channel, so champions like Alistar, Darius, and Lee Sin can put a real strain on his gameplay.