Unbreakable Stoicism

Unbreakable Stoicism is a spell that has a casting
value of {7} and a range of 12". If successfully
cast, pick 1 friendly STONEGUARD unit wholly
within range and visible to the caster. Until your
next hero phase, that unit's Crushing Blow ability
causes mortal wounds on an unmodified hit roll
of 5+ instead of 6.