Players who recover iron lockboxes have a chance to find shadow keys which can then be used to unlock one of several express elevators that lead right into the depths of the Shadow Lairs. The bosses themselves will provide "trickier, tougher boss fights [and] will challenge even the bravest, boldest, and best-equipped knights, presenting the greatest challenges the game has seen so far," according to a new Three Rings press release. There's more info available on the official Spiral Knights forums, and you can download the game via the official website.
