Purchased new 3 weeks ago, creased after a dozen sessions... I'm 70kg riding strapless, not too impressed...
I'm not into Duotone at all but there's so many variables that could cause a crease.
I'd be frustrated too. But these things can happen on the 2nd year or the first day. On the 2nd year or doesn't hurt as much.
A bit more info what happened would help, like was it a heavy landing? It looks like it has hit something like a bar is the crease on the other side of the concave also?
I would be taking it back to the shop being that new. I have SLS fish 6 mths no issues whatsoever, Ok my jumps never more than 1m, I'm 95kg they are pretty strong, only minor dents where hit bar end and once where I fell on some rocks while carrying the board. The innegra/skin seems to have some give.
Finished a session and saw it there. It hasn't
impacted anything. If it was after a year i could put it down to usage, but after 10-12 kites? I have had cash-converter grom boards last longer than that!
I jump high, and a lot, but this was the whole reason i got the SLS for an extra $400 rather than the standard whip.otherwise what is the point of the SLS??
Same thing has happened with me. 2022 Brand new board, second session, same crease. I recall a reasonably heavy landing but nothing unusual. On a trip so I had to MacGyver with solares because the crease part was spongy. Held up the rest of the trip though, and such a phenomenal board. but I might try talking with the retailer tomorrow about any recourse.
Worth a chat to the retailer, being so new. Also relate to any signs of heavy landings on deck
Ohhhh goddamm, i was going to complain about my heel dents but that is next level!
Saw the duotone riders break one board like that a day in Brazil !
The true is the board is amazing super light but breaks easy 
I have seen more survive than not....but like all high performance boards they can ping. I can repair this for you for $100 if you like.
Twintip jumping yes, wave riding, no thanks!!
sorry Andre missed your message, its fixed and ready for me to destroy on next week's green arrows. 
i have run into a few more people who have had issues with the standard wam as well. I think all
these boards could handle a few hundred grams more weight for a bit more durability.
'nuff said in case duotone use the same lawyers as crazyfly 
I have experimented with Innegra Not keen on it for strength But can be good if used correctly with other layups of materials / stringer/ Blank type etc
