Terrorblade (TB) is an agile hero that has one of the fastest running and attack speeds in the game. He can also switch to ranged form which allows him to siege and defend himself against other long ranged heroes or nukers. However his most powerful weapon, I believe, is his ability to confuse his opponents with his illusions. His images are an excellent farming tool as well, placing him toe to toe with the best farmers in the game. All in all, he is a very well rounded hero that needs strategy to make him useful to your team. 

You won't be able to score a single kill with him by just using his abilities without thinking ahead. He doesn't have any type of disables that would allow him to score an easy kill. This is the reason why TB is one of those hero online gold that is oftenly neglected in most games. But rest assured that if you follow this guide appropriately you will be able to excel with him in no time.

Characteristics:

Range: 100 | Primary: Agility | Speed: 320 | Armor: 3
Str: 17 | Agi: 22 | Int: 15 | Damage: 48 - 54 | HP: 423 | Mana: 195

Abilities:

Soul Steal

Strangles the soul of a target enemy unit and extracts bits and pieces of it.
Level 1/2/3/4 drains 20/40/60/80 HP per second.
Mana cost: 45. Cooldown: 12 seconds

Conjure image

Creates a copy of Terrorblade which deals damage. (200% damage taken)
Level 1/2/3/4 deals 25/35/45/55% damage.
Mana cost: 70/80/100/115. Cooldown: 17 seconds

Metamorphosis

Transforms Terrorblade into a powerful Demon with a ranged attack.
Level 1/2/3/4 adds 0/50/100/150 HP and lasts 30/40/50/60 seconds.
Mana cost: 125/115/107/100. Cooldown: 180/165/150/135 seconds

Sunder

Sunder severs the soul from both Terrorblade and a target hero online gold, then exchanges them, carrying part of the units' life forces. The percentage hit points of each unit are switched with the souls. Some hit points must remain on enemy heroes.
Level 1/2/3 cast range 250/250/250.(33% / 28% / 23% hitpoint minimum
Mana cost: 250. Cooldown: 200/180/160 seconds

One last pointer before we move on: All these abilities are adaptable; therefore any type of item can work well with him. I guarantee this hero online gold is perfect for any type of team match due to his incredible ability to adapt to the circumstances.