Hello guys and welcome to my Fiddlesticks support guide. This is my very first guide and I have decent experience at the game. I haven't seen many support guides for Fiddlesticks so I have made one for you guys. I enjoy playing Fiddle because he is incredibly fun to play. Enjoy this guide and prepare to piss off the enemy.

Pros:

Genital Innuendos
"Accidental" Kill stealing
Fearing the enemy away
Role viability (any role)
CC

Cons:

Low Health
Squishy

We have a generic AP Support Rune page. We have Scaling Armour Seals and Scaling MRs Glyphs as they scale well into late game and honestly you won't need much defenses early thanks to your Q.

I would take 12 in Ferocity and 18 in Resolve since with this build you will have the annoying fact of having full health after using your W.

Ferocity (12):

As a support you are going to want Expose Weakness.
Vampirism for healing benefits. Increased by Runic Armour in the Resolve Tree
Battle Trance will increase damage from W which is important.

Resolve (18):

Unyielding and Siegemaster for will be necessary as your W makes you vulnerable to damage and CC (Crowd Control) and stops you from immediate execution by jumping in with your R.
Runic Armour for healing benefits. Increases Vampirism in the Ferocity Tree
Insight allows for Summoner Spell cooldown resist.
Swiftness for Tenacity and Slow Resist
Courage of the Colossus is your main keystone. Make sure to use your Q and E.
Take Stoneborn Pact if your lane partner is Auto-attack reliant (e.g. DRAAAAAAAAAAAAAAAVEN)

Start Items:
With Spellthief's Edge, you gain more gold as Support as well as quest completion grants movement speed. The ability will temporarily stop upon minion kill so you are going to want to weaken minions with your E and let the ADC take the kills. Mid game you will want to build Refill Potion into Corrupt.

Early Items:
Blasting Wand grants some early AP. Proceed to buy Boots and then if the enemy will be a pain (e.g. Zed, Veigar) take a Negatron Cloak for MR or Chain Vest for Armour.

Core Items:
Blasting Wand into Liandry's for the boost in damage and Magic Penetration (aha get it penetrate. Always Q the enemy champion before attacking. Then build a Rylai's for added CC. You then build either a Zhonya's against physical damage and the Stasis passive (works with your ultimate) or Spirit Visage against magic and stronger heals.

Flash is a must have as it teleport you a sort distance. Great for escapes and chases. Exhaust is great for you as a Support since it reduces the targets damage output and speed. This allows you to stop them from dealing too much damage to you and your lane partner and gives them a harder time escaping your Drain and ultimate.