RoboTech: The Sentinels #5: Rubicon

Optera! Birthplace of the Flowers of Life and their agents of retribution, the Invid . . . nexus for an unfolding of events that had left the galaxy reshaped and redefined . . . and now the focal point of the Sentinels' long campaign to liberate the Quadrant from the Regent's tyranny.
Edwards is on his way to Optera, in flight from Tirol with his prisoner Lynn-Minmei and a handful of Invid Inorganics under his control. So too are Breetai's Zentraedi — closing on the very world the Imperative…