Hero Phase - Spell

Arcane Bolt :
Casting value {6} and a range of 12"
If successfully cast, at the start of any phase
until your next hero phase, you can pick 1
enemy unit within range and visible to the
caster. That unit suffers 1 mortal wound.
If that unit is within 3" of the caster, it
suffers D3 mortal wounds instead of 1.