Bristleback arrived in Dota 2 with an update released March 28. According to his official profile, his skills include Viscous Nasal Goo, which "covers a target in snot, causing it to have reduced armor and movement speed," Quill Spray, which pierces enemies, Bristleback, in which he covers his back in spines to reduce damage taken and Warpath, which allows him to move faster and cause more damage every time he casts a spell. Check out YouTube user DotaCinema's video above to see his excretions in action.
The title update also fixes many gameplay elements for several enemies, tweaks the user interface, visuals and audio and adds items to the Dota 2 store. You can read through the details on the game's official website.