Terrorblade

Terrorblade is a melee Agility Carry with a focus on a limited amount of powerful 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 high starting armor but low starting health making him particularly vulnerable to early game spell damage.

Tips

 * Satanic could be considered as an alternative to Heart of Tarrasque provided you can deal enough damage for the lifesteal to be effective.
 * A Blink Dagger allows you to close large distances instantly to get within Reflection's extremely short range, allowing you to initiate and hopefully kill lone targets without the help of an ally. It also provides you with a much-needed escape.
 * 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-risking mistake.
 * Terrorblade's item builds are versatile, and can range from an early/mid-game oriented build such as Ring of Aquila, Drum of Endurance, and Sange and Yasha, to a more conservative late game build such as a Linken's Sphere rush into Manta Style (similar to how you can itemise or ).
 * Terrorblade's extremely high armor allows him to trade auto-attacks and tower dive with impunity in the laning phase, especially when combined with a Poor Man's Shield. However, the trade-off is his low health pool which makes him very susceptible to nukes such as Finger of Death or Laguna Blade.
 * 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.
 * Shadow Blade is a great initiation and escape item, which also allows you to get close enough to your enemy and use Sunder without risk. It also provides great damage and attack speed, both good attributes in all stages of the game.
 * Terrorblade excels at split pushing in the mid and late game, where he can summon up to four Metamorphosed illusions with a Manta Style. Additionally, Sunder allows you to dominate any one-versus-one fights with heroes who don't have enough lockdown to prevent you from casting it.
 * Similarly, with enough points in Conjure Image, Terrorblade can become an efficient jungler who can clear multiple camps with reasonable speed.
 * If the enemy team lacks heroes with a strong auto-attack, consider putting points into stats instead of Reflection.
 * If a fight allows, try to pre-emptively cast Metamorphosis so you can maximise the uptime of metamorphosed illusions.
 * Sunder mini-stuns the target upon use and goes through magic immunity. This mechanic can be used to prevent heroes from teleporting home to safety or to interrupt deadly channeled spells such as Death Ward.

Trivia

 * Terrorblade was 's twin brother in DotA. Valve originally planned to retain this relationship in Dota 2 based on Anti-Mage's certain responses, but these responses were removed upon Terrorblade's release, thus sundering 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. It is speculated that the name was changed to avoid conflicting abbreviations with Sand King.
 * In-game, Terrorblade constantly leaves flaming footprints wherever he goes, similar to his DotA hero model, Illidan Stormrage (also prominent Warcraft character), 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.
 * Terrorblade's ultimate is one of the two components of the most effective combo in the game against tanks. It will instantly kill them, no matter how much health they have. The combo is a low-health Sunder + Necrophos' Reaper's Scythe.