Custom fan work of mine (the Gray Knight part, the Barbarian was not by me, just the Gray Knight parts.) Made up the Gray Knight character, cards, tokens, etc. etc. It does exist in that I got every piece including the box printed for myself, just not for sale.
Made it for myself using the rules of another character (guess which), just changed the character art. Fun project for fun sake, but time consuming. I had to remake every asset from the card design ui and make up my own character and the cards/tokens/dice for it. :)