Kithron

It's listed under the Dimensional Merchant. You have to click on the event button to look for the hero coin exchange window to trade any hero coins you have left.

Throne and Liberty will be coming out in the future. There will most likely be no action from NC West at this time to save the game. I don't expect them to do anything either. If this game becomes unprofitable they will close it down for the region like they did to the original Lineage game years ago.

Beta test anything? That's a good one. NCWest pretty much yanked the public test servers years ago. I'm still amazed how this company operates these days.