I just got my summoning to work just now. I had to cancel the meta mask transactions and increase the network fee. As for arena looks like you need an opponent to fight against, maybe wait a bit longer til more people enters the arena. Wish I have five level 5 to enter the tournament, looks like your split the prize of 0.41 among the winners. Right now only one participate is in the tournament lol. Does that mean he gets all the rewards(0.41 ether).