How to unlock random arena for a new character?

How to unlock random arena for a new character?

my other lvl 20 characters have random arenas but i cant find RA on my new creative character, need answer for that, ty in advance.

you must beat 5 diiferent team builds in zaishen elite to unluck Ra, and then youll have to go on a 5 consecutive run in RA to unlcok TA!!!

Have fun went on th 15 straight win last night in ra with my BM ranger 9 flawless way fun!!! HEHEHEH! RA Pretty cool even got teamed up with one of my guildies!!!!!! what the chancesssssss!!!!

ty very much