The same thing happened with me.
I'm main Spiritmaster, my account have various casting speed character (i think just one attack speed). I left my SM logged in (sometimes afk, sometimes not), and on Saturday I got my legendary transformation and.. Ta daaa... "HAMERUN".
I did a ranger for me after This, cuz this is my first legendary... And I think will be the only one.
But, I'm serious thinking about leave aion. I'll disapointed and very sad.