Indomitable foes

Use this Stratagem when a RUBRIC MARINES
unit or SCARAB OCCULT TERMINATORS
unit form your army is chosen as the target of an
attack. Until the end of the phase, improve that
unit's invulnerable save by 1 (to a mximum of
3+).

Damage that would fell mere mortals is simply
ignored by the lifeless automata of the Thousand
Sons.