Techies

The Techies are as yet unreleased heroes (slated for release after The International 2014).

Having little direct combat ability, the Techies have an unorthodox, if effective, method of dealing damage to the enemy team in the form of powerful laid explosive mines and stasis traps that enable other heroes to set up a gank or retreat. Their mines, set across key points of the map -and even less conventional locations- are an effective method of denying area and guaranteeing damage if enemies dare to initiate.

They have an even more bizarre ability in the form of their Suicide Squad, Attack! which causes them to violently explode and die but deal massive damage (at early - mid game) in a moderate area of effect.

The unique mechanics of the mines mean that the Techies utilise mechanics not used by any other hero, including preemptive mine concaves and such strong area denial that they actively play a large role in securing the area controlled by friendly heroes.

The Techies have statistics aligned to those of semi-carries, but largely play a passive, defensive role throughout the game. Their unique utility is slowly lost throughout the later part of the game, but as with other supports their long cooldown ability Suicide Squad can still be quite effective.

Trivia

 * Some of Techies' lines, such as tech_rival_11.mp3 "They're going to have to glue you back together! Yeah, in Hell!", reference lines spoken by the Demoman from Team Fortress 2, another title by Valve.
 * Many of their lines also reference Counter Strike, such as "Counter-Techies Win".