Dota 2/Balanar the Night Stalker

Night Stalker is a melee strength hero who is usually played as a ganker, though he can become a semi-carry during the mid-late game. By day, Night Stalker is mediocre as best, having inferior vision and weak abilities. However, once the sun sets, Hunter in the Night activates, turning Night Stalker into a swift and deadly killer. With Void, he can slow enemies down to a crawl, letting him catch up to them. He can induce Crippling Fear into his opponents, silencing them and rendering spellcasters helpless to fight back. While Night Stalker might seem to be at the mercy of the in-game clock, he can use Darkness to turn day into night, or extend his reign of terror during nighttime. When night falls and Night Stalker is on the other team, be careful of becoming his next victim.

Void
Void slows the target and deals damage to it. It lasts longer during the night. It is a basic damage nuke that also slows enemies pretty well. You can use it to hinder an enemy's escape or to catch up to fleeing enemies. The damage it deals is slightly higher than most other single target spells, so it can also be used for harassment.
 * Ability: Target Unit
 * Affects: Enemy Heroes
 * Damage Type: Magical
 * Damage: 90 / 160 / 255 / 335
 * Day Duration: 2
 * Night Duration: 4
 * Move Slow: 50%
 * Attack Slow: 35%
 * Mana Cost: 80 / 90 / 100 / 110
 * Cooldown: 8

Crippling Fear
Crippling Fear silences the target while causing its attacks to have a chance to miss. It lasts longer during the night. The silence works well against spellcasters while the miss chance works well for physical attackers. Combined with Void, the enemy will have a difficult time escaping or fighting back, making them easy prey.
 * Ability: Target Unit
 * Affects: Enemy Heroes
 * Day Duration: 3
 * Night Duration: 5 / 6 / 7 / 8
 * Day Chance To Miss: 10%
 * Night Chance To Miss: 40%
 * Mana Cost: 90
 * Cooldown: 12

Hunter in the Night
Hunter in the Night increases your movement and attack speed during the night. Along with your other normal abilities, it makes you significantly stronger during the night, though remember that it does absolutely nothing during the day. The speed bonus is enough to let you chase down enemies mercilessly and overwhelm them with attacks.
 * Ability: Passive
 * Move Speed: 20% / 25% / 30% / 35%
 * Attack Speed: 30 / 45 / 60 / 75

Darkness
Darkness will pause the in-game clock and turn daytime into nighttime. If used during nighttime, it will prolong the night. It is usually more advisable to use it to extend the night, as you can keep your momentum if you had been doing successfully during that particular nighttime. Nevertheless, it could be useful to turn daylight into darkness during emergencies to help you escape or make a comeback.
 * Ability: No Target
 * Duration: 25 / 50 / 80
 * Mana Cost: 0
 * Cooldown: 180 / 150 / 120

Aghanim's Scepter can be bought by Night Stalker and will passively grant him unobstructed vision during the night, meaning that he can see units on high ground or behind trees. It does not affect Darkness and will do nothing during the day.