I am wondering which boosts affect Hydra Units. I'm mostly focusing on the permanent boosts but any additional info is appreciated. So as far as permanent boosts I found 3 boosts I think should be affecting Hydra units. Captain 20%, battering ram, 10% and Divine selection: 10%. Do all three of these stack for Hydra Units? On top of that do the temporary boosts such as improved attack or improved defense stack on top of these other boosts specifically for Hydra as well? I understand some of the heroes may have helpful boosts for this as well but I don't have any of those heroes at this point. Thanks for any help provided.