Hey there. I'm (Dravεη) Draven on EUW, placed Gold 2 this season, trying to reach up high Platinum 1 and ahead. I played since early before rankeds existed back in 2010ish~. I hope this guide provides you with all the infos you need. Feel free to comment me any criticism so that i can further improve this guide!

This is supposed to be an in-depth guide and will be extended day by day - enjoy!

Roadmap:
Introduction - Almost done
Abilities - Done 14th of March
Pros n Cons - Done 16th of March
Gameplay - Open
Runes - Almost done
Itemization - Open
Tips & Tricks - Open
Conclusion - Open

Jump directly to:
Pros n Cons
Runes

Remember: All your damaging abilities trigger your mark onto the HIT enemy. This means, you will attack them twice.

	Get the chance to steal the soul of the enemy, heal yourself and inherit his abilities for a short duration.
	Comparable to Yasuo Q. Stab forward in a straight line to cause damage and inflict your mark.
	Comparable to Morgana Q (along with Xerath's Q range scaling) combined with a dash. The range of the dash cannot be enlargened through channeling, the range of the stun and duration though. Inflict your mark.
	Camouflage yourself like Twitch is able to. Gain movespeed and attackspeed while in area of the mist.
	Like Zac plunge (in this case teleport) unto the target location, but without knocking up your targets, to deal damage. Inflicts mark.

Pros		Neutral		Cons
+ Versatile Kit + High Damage + High Mobility + Hyper Scaling		Harrowed Path can reveal position		- Relatively weak early - Missed Spectral Maw can be lethal - That's all.

More info in "Tips & Tricks" section

		Most probably the most potent of Keystones because of its boost in sustain at full stacks, which you get decently fast.				The strongest of Keystones for early and late 1v1's. Very viable for fast scaling and fending off enemy junglers easily.
		Must have - Extra gold per kill AND clutch heals. Almost no competition for this rune.				Must Have - You will need this for more attack speed. Legend: Tenacity might be better in really tricky cases.
		The cherry on top, another damage boost to your already overwhelmingly strong 1v1 kit.				Deal more damage the lower you get. In my eyes the best pick, especially with Conqueror.
		Stack more damage with the kills you get. The first row doesn't offer any permanent bonus of this kind.				Really good on you, since you deal high damage with abilites anyway.
		Add even more healing to you kit that gets stronger the lower you are. Strong on Viego				Strengthen your heal and sustain even further. Overgrowth is also viable since you want to scale for late game.
		Also viable, but has 45 second cooldown. This doesn't belong to late game. It might help you fight and scale in early though!				Only makes a difference in lane. No no for jungle Viego.

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I like using these two tress the most. PTA for explosive 1v1's. Conqueror for big skirmishes and team fighting at the end.
Grey marks an option, that is also viable.