Got this after I had already unlocked an All-Star Akali. A legendary needs 1520 orange essence to unlock, but I'm sure I will get there (eventually).
And I have not spent a single penny on this account. Not one.
The RP was free from whenever Riot doled out freebies. Got so many champs, I don't care about IP anymore (I think I have 40 champs left to unlock).
Almost 5 years out, all I can say is that this game can get addictive, gotta watch out.