Attack vs. damage

I see that I can put up the attack of my creatures as well as their defence through spending royalty points. What is the difference between attack and damage in terms of mechanics?

Thanks.

Rob

Attack works on some skills that damage doesn’t. Calamity, for example, will use attack but not damage. The only place I’ve ever seen the damage bonus is on direct attacks, or skills that come from direct attacks (like hunters). Combining both would be more efficient, as it’s cheaper, but won’t benefit skills that only use the attack value.