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2Shaddar, do you remember when we played? Do you remember how 53 riders (out of 123, with 70 killed by hidden archers when the "sworn enemy" ability triggered) killed 23 upgraded unicorns without any luck, and after moving only 3 squares! I'm saying that you can position the riders so that they scatter over 2-3 squares, and that already hurts! If you give the riders an initiative of at least 1 higher (I mean the standard one), then many will have the same problem with this unit. IMHO.
Regarding the new units, I can say that they looked good against the Necropolis, as did the new furies. I don't know how they perform in a quick game; I rarely took them, i.e., I experimented, but I prefer to take the old ones. IMHO.
P.S. I will experiment with the new upgrade!