i suggest you to start looking all of these first :
http://www.resurrectionacademy.org/t2907-rda-changes#p26938
http://www.resurrectionacademy.org/t2906-dorms-system-skill-points#p26937
http://www.resurrectionacademy.org/t2904-battle-tower-arena-main-rules#p26934
http://www.resurrectionacademy.org/t6-shadow-arena-main-rules#p7
http://www.resurrectionacademy.org/t5-unlimited-arena-main-rules#p6
http://www.resurrectionacademy.org/t2905-battle-tower-ranking#p26935
and finally our newest event
http://www.resurrectionacademy.org/t2915-rda-casual-8-sign-ups-opened#p26964