Omg.
One one hand: okay, so I don't waste the KH Aura on the Arch-Revenant. But then: almost no buff for a new unit in the entire book. I mean, we have two shooting units, so who designs the Arch-Rev CA and thinks: "oh, wow, better make it melee only, so the mass of shooting units with all their other shooting buffs don't get too strong..."
At this point I thought about 2x5 archers and 2x5 Tree-Revenants as harrassing teleporting units grabbing objectives when you need them.
But first, MSU are harder to buff with CAs, that includes the free Tree-Rev CA and second 660 points are a lot for just looking good and doing minimal disturbing stuff.
Shame.