Log Horizon, Vol. 11 (light novel)

The most powerful of the ancient race vs the peerless mad-warrior! After becoming completely lost, Krusty finds himself with nothing to do in the enchanted lands of the Chinese server. Meanwhile, nearby Krusty's location, Kanami ventures into the Sirius Grotto Dungeon to explore. However, Elias is considered "too powerful," preventing him from entering and participating in the dungeon raid! He begins to harbor doubts about the meaning of his won existence but before long, everything will change after his world and Krusty's collide!