Yo'gand's Core was a battle tactic employed by the extra-galactic Yuuzhan Vong species to destroy entire planets. A warlike race, the Yuuzhan Vong utilized biotechnology in all spheres of life; one of the many creatures they made use of was the dovin basal, an organism capable of manipulating gravitational fields. During a war to gain control of the Yuuzhan Vong galaxy, the warrior Yo'gand was confronted by the forces of a rival warrior, Steng, who was based on the heavily fortified world of Ygziir. Rather than fight Steng's forces directly, Yo'gand created an innovative tactic. He secretly installed a dovin basal on Ygziir and instructed the creature to harness Ygziir's moon through gravitational manipulation. The dovin basal then pulled the moon in closer to Ygziir until its orbit decaye