""You are being held by a force of two gravities… THREE gravities. Six will crush your ribs to jelly and explode your heart. FOUR gravities. FIVE… I suggest you leave now.""
A gravitation ring is small type of device of Minbari origin that can be worn on the finger like a typical finger ring. The ring can increase local gravity at least five or six times.
Delenn owned such a tool along with several other power rings and were kept in a secret wall locker in her quarters on Babylon 5. This device was used by Ambassador Delenn in 2257 to force Ambassador G'Kar to leave her quarters.  Many years later, Delenn would observe how much G'Kar had changed from the man who she had to force to leave her quarters with the gravity ring.