“I had the opportunity this year with Penrith and I wanted to grab it with both hands.
“I know I need to keep working hard to improve, I’m still young, but it’s a great reward for all the efforts I have done while I have been with the Dragons.
“I would like to thank the club and the fans for all their support.”
Dragons CEO Christophe Jouffret added: “Ben has been one of our priorities for the future , not only for his on field performance but also for his professional behaviour off it.
“We negotiated with Ben and his agent over the past three months and it’s a big loss to us to see him leaving the club.
“We wish him all the best in his new challenge with Penrith in the NRL.”