By Vow and Royal Bloodshed - Blood Ladders, #2

Restored to a working body, Morgan Locke has returned to Troth to seek the legendary athenaeum at Vigil in the hopes it will produce a solution to the enchantment binding the elves. But elves are not the only creatures now stepping out of folklore: the demons are coming, and they bring with them the armies of the dead. If they do not want to see their world consumed, Morgan and his companions will have to find the answers, whether they come from books...
or bloodshed. Time is running out....