Some troops have such high morale, or lack of individual willpower, that they never break.
In comparison to Epic 40,000, we separated this ability from parts of the Tyranid 'Synapse Creatures' rules and the 'No retreat, no surrender' rules for war engines.
Where your detachment has the Unbreakable ability:
The detachment can never become Broken.
|If you lose a close combat or firefight with the detachment then you must still make a Retreat move with it — unless it also has the No Retreat ability.|