Daemonic units are Unbreakable. However, when a unit of Daemons loses a combat it must take a Daemonic Instability test. This works like a normal Break Test, except that for every point they fail the test by, the unit suffers one additional Wound with no saves allowed.

If characters are present in the unit, the controlling player first allocates Wounds to the unit (up to their current Wounds), then divides remaining Wounds as equally as possible amongst any characters.

The Daemonic Instability test can be rerolled if the Battle Standard is within 12", use the General's Inspiring Presence rule, and/or be tested on unmodified Leadership if the unit is Stubborn or Steadfast.