Lord of Ruin — Dan Abnett

In the world of Warhammer, no race is as cruel and treacherous as the dark elves, and no member of this race is more infamous than Malus Darkblade. Now that he has retrieved the five missing artefacts, Darkblade must return them to the daemon before the year is up. But can Tz'arkan be trusted to honour his part of the bargain or will he try to trick Darkblade one last time?