Log Horizon: The West Wind Brigade Vol. 7 (manga)

Soujirou is conducting special training in hopes of acquiring power from outside the system. However, just under their noses, an army of more than ten thousand Goblins appears on the Zantleaf Peninsula! In the face of this unprecedented situation, the West Wind Brigade musters its best fighters and sets off to guard the Ancient Court of Eternal Ice, where the nobles are assembled!