Purple Dragon

[Goekhan]

At first levels, Ball of Lightning will be somewhat useless. Low shock chance, low damage%. And since enemy total HP will be also low, Crushing Blow will defeat Ball of Lightning.

And N3M3S1S, you're totally incorrect. It's basic calculus for God's sake. Increasing health of a troop doesn't mean stack number grows bigger. Total stack hp gets bigger.

Use it when you face an enemy stack(s) with very high total hp.