Valve has just unveiled what will be the first of five new mutations of Left 4 Dead 2 coming with the new expansion "The Sacrifice", which can be purchased on the marketplace as of October 5: "Taaannnk!". The new mode, playable in Adversary, will transform continuously and simultaneously to all the other allies in Tank, the most dangerous of Special Infected, to take out the entire crew of Survivor as quickly as possible.

New mutations, which will remain exclusive to Left 4 Dead 2 and the previous owners of the expansion "The Passing", will be included less frequently so as not to be wasted already during the first five weeks and will then be integrated with those the old cycle.

Among the novel mutations should be present "Ultra Realism", "VIP Target" and "The Last Samurai" never previously used. Appointment the next day for the rest of the new DLC.