IMAO the rider's mount should be an extra ability (a customizable innate). This would further distinguish the rider from other hack 'n slash champs. It is strong enough to win with if munchkinized.
30d6 sneak attack is nice. It will cause newb deaths, and increase lameness but it can actually force masters to stay home during fights. (Shadow Projection FTW!) If hiding is made possible, 30d6 is nice. If it's not, assassin is OP and needs to be killed first.
Perhaps make assassinate possible only on champs? Masters would receive normal sneak attack damage instead?
On the whole I don't see the balance a problem, because both full attack melee and high damage spells are equally broken, creating a need to either to trust AC or SR (my experimentation in PSW2 shows HP just doesn't cut it). Basically if a player wants to survive, he must prepare for only both fighter and sorcerer. (Hello Shadow Projection, Counterspell, Displacement and Blink just to name a few; defensive playing is possible.)
What I'd want to see is coolness and deception beating munchkin defences. Perhaps bonus mana for RP!
Bottom-line: 30d6 isn't broken compared to other stuff, mount should be an innate because it's the core of Rider.
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