Dark Vs Light level 25 packs

They come in your in-game mail. And you might want to double check and make sure it gave you credit for it under the achievements tab (Events>Dark vs. Light).

@KronosIllirea

You did create the Charakter after June 28?

I received no achievement for it eather

@oldterry

 Again Char created after the Event started?

The Achievement and therefore the Reward a once per Legacy.