Night Stalker is a melee strength ganker and semi-carry. He is notable for being one of the few heroes in the game whose skillset is affected by the time of the day in the game.
During the night he becomes significantly stronger, gaining bonus move speed, attack speed, sight range, as well as more powerful actives, making him a fearsome night-time ganker.
Skills
Void is always skilled and maxed first.
Crippling Fear is usually skilled and maxed last, but at least one early point is a must.
Hunter in the Night is usually maxed second.
Darkness is always skilled (levels 6, 11 and 16).
Items
Starting Items: Tangos, Healing Salve, 3x Iron Branches, Stout Shield.
Early Game: Phase Boots, Bottle, Magic Wand, Urn of Shadows.
Luxury Extensions: Armlet of Mordiggian, Black King Bar, Assault Cuirass, Aghanim's Scepter, Monkey King Bar, Crimson Guard, Heaven's Halberd, Abyssal Blade, Desolator, Satanic.
Situational Items: Boots of Travel, Vladmir's Offering, Necronomicon, Drums of Endurance, Vanguard.