Dota 2/Slithice the Naga Siren

Naga Siren is a melee agility hero usually played as a carry, but is known for her powerful initiation. She has one of the best single-target disables in the game with her Ensnare, as it goes through magic immunity and lock them down for an absurdly long period. She also has respectable pushing power and dps with her Mirror Image illusions, which she can also use to deal high AoE damage using Rip Tide. Her ultimate, the infamous Song of the Siren, is feared by everyone. It gives her team a great advantage, letting them set up other initiation spells or escape. While she might not carry as hard in the later stages of the game, Naga Siren is a force to be feared, and one hero you should never underestimate.

Mirror Image
Mirror Image creates three illusions of yourself. You are briefly invulnerable as you cast it, and it can dispel projectiles. These illusions are great for pushing towers, and it can increase your damage output due to the increased numbers. Once you get more durable from items, your illusions will also be harder to kill, to the point that you can send your illusions to push or farm a lane while you're pushing or farming another.
 * Ability: No Target
 * Duration: 30
 * Bonus Incoming Damage: 500% / 400% / 300% / 200%
 * Illusion Damage: 30% / 35% / 40% / 45%
 * Mana Cost: 70 / 80 / 90 / 100
 * Cooldown: 40

Ensnare
Ensnare locks down the target, preventing it from moving or blinking, but the target can still attack and cast spells. The most important feature of Ensnare is that it goes through magic immunity, and can interrupt channeling spells. As it lasts 5 seconds at level 4, it can be a very powerful disable that can halt an enemy's escape completely. If you have allies nearby, that enemy is as good as dead.
 * Ability: Target Unit
 * Affects: Enemy Heroes
 * Duration: 2 / 3 / 4 / 5
 * Mana Cost 75 / 85 / 95 / 115
 * Cooldown: 14

Rip Tide
Rip Tide damages and reduces the armor of enemies around you. Your Mirror Image illusions will also perform Rip Tide when you cast it. If an enemy is caught between multiple Rip Tides, they will only take the damage of one. It is great for pushing creep waves or damaging multiple enemies during teamfights. The armor reduction is also helpful for softening up enemy heroes.
 * Ability: No Target
 * Damage Type: Magical
 * Damage: 130 / 160 / 190 / 220
 * Armor Reduction: 2 / 3 / 4 / 5
 * Mana Cost: 80 / 90 / 100 / 110
 * Cooldown: 19 / 16 / 13 / 10

Song of the Siren
Song of the Siren makes all enemies in a large radius to fall asleep, completely disabling them but making them invincible. It can be a very deadly initiation spell that helps your allies set up their initiation spells. You can catch 3-5 heroes at the beginning of the teamfight and make them watch helplessly as Enigma waltzes in for a Black Hole. It can also be used to escape very bad situations, letting you teleport away or simply walk away as your enemies are asleep. Once it gets to level 3, it gets an insanely short cooldown of 60 seconds, short enough to give you a song of the siren for just about every teamfight. One thing to remember is that your enemies are invulnerable while asleep, so make sure your teammates know that you're going to use a song of the siren. The last thing you want to happen is to waste a Ravage or a Black Hole on a group of sleeping enemies because of a bit of miscommunication.
 * Ability: No Target
 * Duration: 7
 * Mana Cost: 100
 * Cooldown: 180 / 120 / 60

Song of the Siren Cancel
Stops Song of the Siren early.
 * Ability: No Target
 * Cooldown: 1