Kyber-5

Kyber-5 is either a planet in the Kyber system, or the fifth moon of a planet named Kyber.

Fiction

Transformers: The Game

Ironhide was responsible for the destruction of Kyber-5, in a way that was almost certainly violent. When Optimus Prime requested that he rescue Jazz, he warned Ironhide not to make another incident "like Kyber-5". Ironhide defended his actions to Optimus by claiming that "that hunk of rock was going to blow up anyway." Whatever happened there, it's a testament to one thing: Ironhide is waaaaay too trigger-happy. Transformers The Game

The AllSpark Almanac

During his time at the Autobot Academy, Optimus Prime was tested on a virtual training simulator, which pitted him in combat with Megatron Survival Skills on Kaiba V [sic]. Kaiba V was later destroyed. The AllSpark Almanac II