Arena Energy is like a currency
do not waste it on random people!!!
mantain the exp within the clan.
the most effective way to level in a fast way is to exchange
its very easy for every energy u have u can multiply it by 2 how??
well go to battle arena, and type exchange with anybody,
once u have somebody to exchange u sent him 2 fights, in return they sent u 2
preferible is good if you win the fight, but if you are progressing
then it doenst matter, as long as you get ninja exp,
in my case im a camper, so i need summon exp, so every timei challange i try to get an exchange,
that way i dont give away my precious energy to people that wont return the favor,
a good way to do this is either go to BW chat
Http://www.BWclan.net/chat
or in battle arena chat
http://www.ninjamanager.com/arena
also here on our chat.
will edit for more.