The Jaws of the Kraken

The Tyranids of Hive Fleet Kraken penetrate the boundaries of the Farsight Enclaves. War is joined against the Tyranids on Vior'los, most populous of the Enclave Sept worlds. Commander Farsight comes out of exile in order to lead the defence, and sees that the T'au need heroes now more than ever before. Farsight's favoured Mont'ka tactics prove largely ineffective against the Tyranid hordes -- their leader figures are so common as to render the strategy moot. The Earth caste scientist O'Vesa persuades Farsight to try Kauyon, the strategy of the Patient Hunter, and Farsight reluctantly agrees. Whilst defending an Earth Caste research facility with seven of his most trusted commanders, Farsight buys O'Vesa enough time to develop a bio-toxin that kills the entire splinter fleet.