Minotaur

All Space Marine units change their [Chapter] keyword to Minotaur. All units with the Minotaur Keyword gain the Allegiance: Minotaur special rule. The Allegiance: Minotaur special rule consists of the following rules:

• Sanctioned Fratricide: Minotaur units gain the Preferred Enemy (Space Marines/ Chaos Space Marines). Enemy units engaged in combat with a Minotaur unit may not make Retreat Moves in the Movement Phase.
• Forever Apart: Minotaur armies may not take any Allied Detachments except for Allies from Codex – Imperial Agents.