Dota 2/Riki the Stealth Assassin

Riki is a melee agility carry hero who is known for being very elusive. He can stay invisiable forever with his Permanent Invisibility, stalking his enemies without them even knowing. His Smoke Screen helps him evade attacks as well as disabling enemies, while his Blink Strike is excellent for chasing or escaping.

Smoke Screen
Smoke Screen makes a lingering puff of smoke appear in the target area, silencing, slowing as well as causing enemy attacks in the smoke screen to miss. A helpful disable to let you escape enemies or catch up to them. Remember that since enemies can only be affected by the Smoke Screen if they stand in it, you should put them in the direction of where they will be instead of where they are, for a better chance of catching them longer.
 * Ability: Target Point
 * Radius: 250 / 275 / 300 / 325
 * Miss Rate: 40% / 50% / 60% / 70%
 * Slow: 25%
 * Mana Cost: 75 / 80 / 85 / 90
 * Cooldown: 13

Blink Strike

 * Ability: Target Unit
 * Damage Type: Magical
 * Damage: 30 / 60 / 90 / 120
 * Range: 700
 * Mana Cost: 50
 * Cooldown: 20 / 15 / 10 / 5

Backstab

 * Ability: Passive
 * Damage Type: Physical
 * Agi Damage Mult: 0.5 / 0.75 / 1 / 1.25

Permanent Invisibility

 * Ability: Passive
 * 'Fade Delay: 3 / 2.25 / 1.5