Goblin Slayer, Vol. 8 (manga)

On the night of the Harvest Festival, an army of goblins creeps toward a border town from the west, but Goblin Slayer's party has a merciless plan to stop them. However, the enemies' leader finally summons the ancient monster known as "Hecatoncheir" in an attempt to crush all in his path. Is this a spell that can best even the Goblin Slayer...?!