Valve may have finally confirmed Deadlock's existence, but that doesn't mean that it's in a finished state. The MOBA shooter is currently in a closed beta (which is invite-only), so there are still plenty of changes to be made and features to be added, one of which is a new hero, Astro.
Astro is more of a DPS, but this cowboy has a couple of interesting abilities. The first one lets you place an exploding barrel, which can either be shot or launched toward enemies, but it'll do more damage the closer enemies are.