Raxolluz is an Ohanedin warlord. He apparently swore an oath at some time in the past to perform one favor each century for a Ducal family in Galli called the Leblancs. While this favor was probably intended to be military, he has been summoned for a number of banal tasks in times of peace, such as juggling, catering parties, and planned parenthood.
After a Goblin invasion, the Leblancs called Raxolluz to exterminate the Goblins in the Hollow beneath territory. The Ohanedin host Raxolluz assembled succeeded in this effort, but what the survivors saw underground prompted them to return to their lands and start preparing for war. Raxolluz has been assembling his army ever since, possibly anticipating some disaster as a result of his actions in the underground.