Why not Expert Slow? :rolleyes:

Expert Slow is helpful against many enemies. Just like resurrect, blind, clone, etc. ;)
I was just describing a tactic that I often use in competitive matches. And I lied in my previous post because with Expert Fire, griffins deal not 3 damage, but only one or two. It depends on where the rounding goes and whether it is applied immediately or to the final damage.

Regarding the physical resistance: "all enemy units deal 80% of their min. damage -1"

That is, for griffins, 1.4 damage instead of 3-6. This is a very big difference, and it helps a lot.