I'm not a fan of chariots but to each his own. I personally would prefer something between cold one and carnosaur, some sort of monstrous cavalry. One thought I had was adding a new army wide rule. With the Deepkin, Maggotkin, DoK, and other factions getting progressive rules like the Deepkin Tide something similar could be a cool way to revamp certain units. Maybe a Primal Fury thing where at the start of the game we get buffs to keep our guys alive as we cross the board. Then as the game progresses they grow more and more savage, increasing damage output and generating fear.