Some of the world's best Dota 2 players are doing battle at Valve's The International esports tournament, but they may need some more practice when they get home. That's because the company just announced it will add two more characters soon in its "The Dueling Fates" update. Neither hero has a name yet, but in the preview trailer the first attacked enemies both by rolling over them Sonic the Hedgehog-style and with a sword, while the other one flew in on fairy wings before releasing a minion to attack.