The Chronicles of Malus Darkblade book 4

Malus Darkblade comes to Har Ganeth, the deadly City of Executioners, in search of an ancient artefact: the fabled Warpsword of Khaine. But time is running out for Malus and the daemon is growing stronger...

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As if Malus' life hasn't been complicated enough already, now he has to contend with the dread guardians of Har Ganeth and risk the, er, less than tender mercies of the Cult of Khaine if his quest is to continue.