At the end of each phase, any unit that suffered one or more unsaved Wounds from an attack with this special rule during that phase must take a Toughness test. If the test is failed, the unit immediately suffers D3 Wounds with no armour saves allowed. If the test is passed, all models in the unit gain the Regeneration (6+) special rule for the rest of the game. Any models in this unit that already have the Regeneration special rule instead gain +1 to all Regeneration saving throws for the rest of the game.