All his abilities are stronger at night, so time your aggression around the day night cycle and dominate the dark hours.

Use Void to harass, secure last hits, and slow targets during ganks, the night slow lasts far longer than the day slow.

Crippling Fear silences enemies standing near you, so use it to shut down casters before they press their spells.

Save Dark Ascension to extend your night window or when it is daytime, the flying vision and damage let you hunt the map.

Farm and play carefully during the day, then use the night to gank and take map control, close the game before he falls off.

He is played as a core because of his night abilities, so itemize attack speed and stats to snowball ganks into towers.