Taskmaster is an emote awarded after completing every achievement that's required for the Task Master achievement. It is the third emote to utilise Z-buffering (the first being Faint, the second being Puppetmaster), taking the player out of the "grid" to which it was restricted in past animations. It requires a clear 3×3 area to be performed.
Upon the release of the Burthorpe and Taverley Tasks on 31 January 2012, the tasks system still said that 426 tasks completed were needed. If a player completed enough tasks, and reached the 426 milestone, they were informed that they could do the task master emote, and the icon would light up in the emote tab. However, attempting to do the emote resulted in being told you needed to complete all tasks. If a player went past the 426 total, the emote icon would become dulled out again. This was fixed. This task set was removed with the release of the Achievements System on 18 April2017.