Krakens

A Kraken is the most powerful and terrifying of all the marine megafauna that inhabit the turbulent oceans of the Death World of Fenris. Similar to a Terran cephalopod in shape but far larger in size and aggressive in nature, a Fenrisian Kraken can grow to be 5 miles long, with tentacles four times that length. The origins of the Kraken remain unclear to Imperial savants. Some believe that they are the remains of a Tyranid bioform that was left on the world during an earlier Tyranid incursion. Separated from the Hive Mind, the Kraken became feral.