Absolute skills

If the "Guardian" skill could be applied to all units simultaneously, it would actually be useful... But as it is, even if dragons attack with -200%, it's not fatal.

Since other factions have similar skills, a "mass support," "mass curse mark," "mass enhanced rune," or "mass enchanted shot" (though something like that could be created) should follow:D
If it's applied to all units, it should only happen after obtaining the special ability (SA). They could even change the special ability for 3.1, 1.7, and 2.2.