This is the way! Love it 
Gur Panthers?
We had 2 KoM armies with Perry Miniatures and dinosaurs in our group. One had raptors like this as Berserkers.
These ones are bigger than horses, so going beast cavalry - para bellum conquest have some smaller types which would work as panthers.
Unfortunately, frenzied Rabble suck!
Yeah. At first glance, they look great with 20 attacks @3+ Me
They have two main disadvantages. The first is the complete absence of crushing.
In KoM you pay a premium for characters -same as all armies- and their commands are utterly garbage. This makes taking a mage for bane chant a complete waste. So they have no crushing and will not get any.
The second, which is IMHO even worse, is their auxillary status. They may in some cases be situationally good enough to take in a core slot, but never in an auxillary slot.
IF they would have innate crushing, I’d spend the aux slot, forgoing more support in order to take them. Alternatively, if they would unlock, same thing. If they had both, they might actually be too good.
And don’t forget Retaliate!
It’s a fantastic rule on Nv18, De5 & regen 5+ grotesques - but terrible when you have Nv 15 & De3 where the likelihood of being alive after being combi-charged is virtually zero.
Also, why restrict them to [2] anyway!
It’s the worst special rule imho. Most units having this rule need no additional CS or don’t withstand a charge of 2 units. But my KoM players used the frenzy Rabble last edition. Nowadays probably nobody plays them (or any comparable unit despite Morax).
