Dota 2 patch adds Legion Commander and 'Wraith Night' survival mode

Dota 2's Christmas update arrives today, and oh! what an update it is. Along with bringing over a new hero from the original DotA, the long-awaited Legion Commander, it adds a wave survival mode which pits heroes against hordes of creeps, trying to defend Skeleton King so he can be reborn as the Wraith King. And there shall be... such... prizes.