Chain Lightning

Lightning bursts from the wizard's fingertips and arcs towards the enemy with crackling fury.
If successfully cast, pick 1 enemy unit within
18" of the caster that is visible to them.
That unit suffers D3 mortal wounds.
Then roll a dice for each other enemy unit
within 6" of that unit.
On a 4+, that other unit suffers D3 mortal
wounds.