Hello,
Well, we could make it similar to the monster arena where you pick up a weapon and everyone has similar status, this could help even those who are just starting out in the game. Regarding the rewards, maybe 1 Ec for each member of the winning team, a fortification stone or perhaps EP, a lot of people only do the temple arena just to get EP and who knows, maybe direct these people to the 3x3 arenas.
Sincerely Aironade.