Is Book of Evil the most horrible spell

[korben]

Originally Posted by Tianx

It does horrible damage and need to recharge after 1 cast. The amount of the cost to cast it is not even worth it to upgrade. Anyone found a good use for it?

It makes enemy heroes waste their mana, which is pretty usefull. And you get some rage for destroying it.
I believe it hase a good magic resistance so you can use it to absorb some damage from certain troops.