Worshipper – “Conquest” [Campaign 2, Mission 3]

I simply don't look for easy ways; it's more interesting that way.

Added 7 minutes later
Regarding artifacts, it's most likely the case; he only applies evasion to dryads. There are no ents in his army, by the way.

Added 15 minutes later
I can't upload the screenshots; the size is larger than allowed.