Check the Hot Air Balloon to access the Hero Exchange feature. Only for today you will be able to get a set of Talent Runes, including Level 9 ones, exchanging 1 x Siren (Evo - Level 1) + 3k gems.
You can exchange this set 3 times.
A couple of days ago I saw this same Hero Exchange at Taiwanese server. Good to find it at US server too. Also, if you have an account at ESP server, Hero Exchange is active there with 3 different options, including one with Talent Runes Level 9 and another with Breakthrough stones.