From Halopedia, the Halo wiki
Design and specifications
A special type of design seed is used to construct Forerunner ships, known as ship-seeds.
During the Human-Forerunner wars, Forerunner starships and Human starships fought one another.
Forerunner ships participated in the Forerunner-Flood war. Some of which became infected by the Flood.
After the Great Purification of 97,445 BCE, Keyships played a role in the Reintroduction of species to their homeworld. One Keyship, the Anodyne Spirit, was hijacked by Mendicant Bias and would end up crash landing on the San'Shyuum homeworld of Janjur Qom. This ship would be later seen as a religious artifact to the species and would later become part of the Covenant's holy city of High Charity.
Ships of type
Other and unknown
Ships of the type