Talk:Katarina/@comment-50.51.128.87-20120813173616/@comment-4709478-20120814165748

You don't unlock champions via levels... you unlock them via IP or RP.

IP is gained through playing the game which can be used on Runes, Rune pages, and Champions.

RP is gained through real money and can be used on Rune pages, Champions, and skins.

There's also bundles of Rune pages and champions, also champions that were just released. Sadly, Diana's bundle sale is now over.