The Darkheart skin is an Epic Fortnite outfit. Darkheart was available via the Item Shop for 1500 V-Bucks and you can buy it from Fortnite Item Shop when it will listed.
Fortnite Darkheart Outfit Details
Statuesque heart breaker.
Fortnite Darkheart Outfit PNG Images
Here is the PNG images of Darkheart below!