The Dirty Way to Destroy the Goddess's Heroes, Vol. 4 (light novel)

With all dirty schemes successfully deployed, Shinichi has gotten the church to agree to a temporary truce. Now that they're finally off his back, he's ready to go on a journey with his motley crew to take on the Goddess herself! Along the way, they discover a place damned by the Goddess-known as the "grave for the elves." They're curious to know more, but they need to treat lightly: the elves are super hostile to humans, and even the undying heroes are no match for them when it comes to magic!