I am not entirely sold on the massive shield idea, although it would definitely be a nice ability to have when you are getting focused in PvP/arenas...it is definitely very interesting. I feel like 10 seconds might be too long, I bet we could get away with 6-8 seconds, mind you I would love 10 seconds of that ability.
I am digging the fury idea with the chain, so how would this work? Would you throw a weapon and then spin or does each attack like throw out your weapon?
I don't entirely understand the prot idea too, do you attach a weapon to your shield or are you just using a 2H with a shield? Elaborate a bit more please!
Definitely like where you are going with the gladiator theme though, I feel like that could definitely become a permanent fourth stance with its own unique abilities and a different play style - maybe one that even prioritizes use of polearms.