Qui'Tu
"Qui'Tu" was a place in Klingon mythology that Spock's half-brother, Sybok, believed he located on a planet at the center of the galaxy. This mythic planet had many names across alien cultures. Sybok believed that a powerful entity existed there, which he called "God", and that all life had originated there. Sybok searched for this planet for many years, collecting a group of loyal fundamentalists as he continued to search. 

Eventually, Sybok and his followers stole the starship  and used it to travel to where he believed this planet to be. However, he discovered that the entity which he had sought for much of his life was a malevolent being, its only intention to travel beyond the Great Barrier and escape imprisonment. Sybok was killed by the entity, and the being was destroyed. ()

External links

de:Qui'Tu
fr:Qui'Tu
it:Qui'Tu
Qo'noS
Mythological locations
Klingonese