Carcharodon

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

• Blood in the Water: Carcharodon units are considered to have Furious Charge special rules when declaring a Charge against an enemy unit that has suffered an unsaved wound or casualty.
• Return to the Void: A Carcharodon army gains the Expendable Keyword on all units at the start of the fifth battle round.