Beginning life as a Warcraft III custom game back in 2009, the original developers have put in the work to make Legion TD its own standalone game. With Legion TD 2, they've been able to implement leaderboards, different game modes, seasons, and a ton of other features.
In Legion TD 2, you battle your opponents to see who can survive the endless wave of enemies the longest. Instead of your standard tower defense where you build stationary towers to output damage, you're building an army to protect your king.