Terrorblade

Terrorblade is a melee Agility Carry with a focus on a limited but powerful amount of illusions. As with any illusion based hero, he requires stats-based items to make his illusions as strong as possible. His unique ultimate allows him to swap his health bar with another hero making ganks on him dangerous without extended lockdown to keep him from casting it. He can create long duration illusions of himself that deal a significant amount of his own base damage and a powerful slow that creates an unattackable illusion of target enemy hero that deals a significant amount of their base damage. His third ability is a potent long duration transformation spell that makes him a powerful ranged damage dealer. He has low starting health but high starting armor making him particularly vulnerable to early game spell damage.

Tips

 * Since your illusions deal a percentage of your agility in damage, agility boosting items are the single best way to boost your DPS.
 * Diffusal Blade provides a great agility boost. Combined with melee illusions, it can allow you to burn a large amount of mana off of enemies.
 * Satanic could be considered as an alternative to Heart of Tarrasque provided you can deal enough damage for the lifesteal to be effective.
 * While Sunder is most often used to save yourself from death or nuke an enemy carry, it can also be used to save allies. However, since Terrorblade often serves as the team's main carry, leaving yourself with very little health can be a game breaking mistake.
 * As Terrorblade should build stats items to make the most out of his illusions, a support such a Vengeful Spirit with her potent aura can help boost the damage of both Terrorblade and his illusions. Venge is also a respectable laning support with her reliable stun.
 * Reflection not only causes an invulnerable clone of the targeted hero to spawn, but also inflicts a powerful 60% reduction for both Attack and Movement Speed, even at level 1. Use it with in the laning phase to ensure a First Blood as well as in the lategame to shut down an enemy carry.

Trivia

 * Terrorblade was Anti-Mage's brother in the original Defense of the Ancients. Valve originally planned to retain this relationship in Dota 2 based on Anti-Mage's responses, but these responses were removed upon Terrorblade's release, thus severing any connection between the two Heroes.
 * Terrorblade's title in DotA was Soul Keeper. Unlike other name changes, this one does not appear to be related to copyright issues with Blizzard.
 * In-game, Terrorblade constantly leaves flaming footprints wherever he goes, keeping in with his Warcraft DotA model of Illidan Stormrage, who also leaves flaming footprints. These can be seen by enemies, but stops being rendered once he's out of their vision, meaning one cannot track down an enemy Terrorblade that goes invisible or slides into Fog of War.