Use Void against a single sturdy troop or a few valuable cards; damage increases as the number of targets drops. It's effective against tanks and support cards, and can damage the tower too.
Tips
Use Void when there's a single tank or valuable card; that's when the damage is highest.
Against crowded swarms the damage is split, so it's less effective.
Troops can walk out of the area, so watch your timing.
Strengths
Very high damage against single targets.
Affects air and ground.
Weaknesses
Less effective against crowded swarms.
Expensive.
Playing against this spell
Cards that help when your opponent has this spell: