. . . "Forerunner bonus reactor"@en . . . "They are reactors built and used by the Forerunners in their ground-based attacks. In some battles, they had time to retreat and detonate them. On occasion they were overwhelmed by the Flood and were not able to destroy them."@en . "They are reactors built and used by the Forerunners in their ground-based attacks. In some battles, they had time to retreat and detonate them. On occasion they were overwhelmed by the Flood and were not able to destroy them."@en .