Please can we have more information about the Jontunheim monsters? I can't find it posted anywhere.

How much energy do they need for one attack? 

e.g with my hero attack a level 1 invader takes 190 energy, level 2 invader takes 337 energy, level 3 invader takes 472 energy, level 4 invader takes 608 energy, level 5 invader takes 743 energy, level 6 invader takes 945 energy, an Uber takes 1148 energy

What % of energy is taken off with one attack?

e.g with my hero attacking a level 1 invader takes off 15%, a level 1 invader takes off 15%, a level 2 invader takes off 7.5%, a level 3 invader takes off 3.25%, a level 4 invader takes off 1.65%, a level 5 invader takes off 0.8%, a level 6 invader takes off 0.4% and an Uber 0.2%