Rides a Dread Legion — Raymond E. Feist

The remnants of the Clan of the Seven Stars are returning to their long abandoned home world ... but not as friends. The elves, led by the conjurer Laromendis, flee the relentless
demon hordes sweeping through their galaxy -- and the conquest of war-weary Midkemia is the Clan's sole hope for survival . . if the Dread Legion does not pursue them through the rift.

The magician Pug knows what horrors will surely follow the elven invasion, for slaughter alone will sate Demon King Maarg's minions. For the death tide to be turned, Midkemia's constant defender must somehow unite bitter foes and vengeful former lovers -- because failure to do so will mean annihilation.