Hi Arctic, I'm glad your players had fun for the most part. Thanks for the feedback! The intent was to make it challenging and have the rabbit be scary, but on reflection doing it like that doesn't match the lighthearted tone of the rest of the module. I'd probably reduce Tier to 1, and maybe make Supreme Melee only able to do free Grapples or Rams or switch it for another trait, like Lead the Charge to play into the mobility.
Just wondering though, where is the 3rd attack coming from? Supreme Melee gives 2, then Avalanche Charge is one but on a 5+ recharge, and Aggression is always available but has to be triggered. I guess you did say potentially though, and that's potentially 4, which is even worse!