Answered Frost Dragons

What you have is good for frost dragons. I'd suggest getting a cannon and using it here though. The cannon will speed your kills up a lot more than you'd think, and you'll end up profiting a lot more despite the loss from the cannon.

The aura that they now have since the update is hardly anything to worry over. All you need to do is have auto-retaliate off and click away when it appears. After the 3rd cycle you can attack the dragon again without receiving damage.

I wouldn't be surprised if you could obtain at least 120 kills/hr. Just make sure to bring a lot of food with you.