Skirmish burst damage.
Burst damage and target access
Hitting a champion with 3 separate attacks or abilities in 2s deals bonus adaptive damage.
Gain a burst of Lethality and Magic Penetration after using a dash, leap, blink, teleport, or on leaving stealth.
Collect eyeballs for champion and ward takedowns. Gain permanent AD or AP, Adaptive for each eyeball plus bonus upon collection completion.
Heal for a percentage of damage dealt with your abilities. Increases with each unique takedown.
Empowered abilities and resource manipulation
Hitting enemy champions with a spell grants maximum mana.
After reaching 250 mana, Manaflow Band restores 1% of your missing mana every 5 seconds.
Gain 10% CDR when you reach level 10. Excess CDR becomes AP or AD, Adaptive.
+5 AD or 9 AP
Sylas is able to quickly proc Electrocute with an [E]->Auto->[Q] combo for massive burst damage.
Both the dash from [W] and [E] allow you to easily proc Sudden Impact for even more damage output.
Sylas is a champion that thrives on skirmishes and fights where he is able to pick up multiple kills/assists making Eyeball Collect a great snowballing choice.
Ravenous Hunter's raw lane/fight sustain is huge for Sylas because you'll be taking a lot of incoming damage as a short range melee caster.
Manaflow Band is quite easy to stack on Sylas thanks to his relatively easy to land [Q].
Transcendence offers you a huge amount of damage output in the mid-game thanks to the CDR and a solid amount of AP in the late game thanks to it's CDR conversion.