Dead of Knight — Annie Bellet

The mute elven archer known only as Killer. Azyrin, a half Winter-orc shaman and his human swordswoman bride, Makha. Drake, the charming, swashbuckling rogue. The fireball-slinging pixie-goblin, Rahiel, and her mini-unicorn, Bill. These are the Gryphonpike Companions.

As the Companions travel across the Barrows to join up with the High Road again, a terrible and unnatural earthquake unleashes an ancient evil on the quiet town of Fallbarrow. An undead army gathers and hellspawn await to destroy Killer and all she now holds dear. Can the cleverness, magics, battle-fury, and determination of the Gryphonpike Companions hope to stand against the Saliidruin and the powerful Death Knight leading them?

This is an adventure fantasy novella.

Also in the Gryphonpike Chronicles series:
Witch Hunt
Twice Drowned Dragon
A Stone's Throw
The Barrows (omnibus edition)