Infinity Blade 2, the iOS-exclusive sequel from ChAIR Entertainment and Epic Games, will soon be getting a content update that adds a multiplayer component to the game. You won't be duking it out in Vs. fights with your friends, however; instead, you'll form or join a group called a "Mob!" and participate in a new "globally social battle mode."
This is the ClashMob feature that you've probably seen Epic mention in relation to Infinity Blade 2 before. In essence, players will gang up together and take on crazy-powerful enemies as a group, earning a variety of rewards successfully pulling off a Mob! kill. The bigger your group, the better the rewards you'll receive. In addition, the new update will also add new equipment to the game, a redesigned gem interface, and a new feature that allows players to forge three gems into one more powerful gem.
Source: Epic Games