E. K. Johnston’s 2019 The Afterward is a standalone secondary-universe fantasy.
Summoned out of oblivion by power-hungry fools, the Old God raised an army of mind-controlled slaves and marched to retake the world it once owned. As so often happens to world-conquering villains, the God was vanquished by seven adventurers led by Sir Erris Quicksword.
The world saved, the adventurers were each rewarded (although not too lavishly) and were free to return to their old lives. Or so some might have thought.