2Shaddar, do you remember when we played? Do you remember how 53 riders (out of 123, 70 of whom were killed by hidden archers when the "sworn enemy" ability triggered) killed 23 upgraded unicorns (new tier) without any luck and after moving only 3 squares!
Regarding the Furies. An upgraded Fury against the Necropolis clearly rules: since the initiative is lower, the "suggestion" spell is less effective on them; immunity to weakening is also good; they have a lot of HP for a second-tier unit; (the stronger the units of the Necropolis are, the more magic the Warlock will cast on everyone). This is all, of course, IMHO...