Great Cat Kingdom

Great Cat Kingdom (ネコさま大王国) was a feline theme Guild that existed in YGGDRASIL.

Background
Great Cat Kingdom was a guild that created NPCs based on cats or other feline creatures.

The Undead King Arc
When Momonga noted that not every NPC in a guild was designed for battle, he look towards a certain guild like the Great Cat Kingdom as a prime example, where fielded no NPCs other than mainly cats or cat-related creatures.

Strength
While the guild's overall strength remains a mystery, Great Cat Kingdom was shown to be capable of conquering a castle dungeon and then converting it into their guild base.

Trivia

 * So far, Great Cat Kingdom was mentioned only once in Light Novel Volume 1.