The midfielder, who arrived at Wolves in August 2016, makes the permanent switch to Caen after two years at Molineux.
Oniangue made 11 appearances for Wolves in the early stages of the 2016/17 season and scored on two occasions before joining SC Bastia for the remainder of the campaign.
From January of 2017/18 the 29-year-old joined Ligue 1 side Angers SCO on loan, making 15 appearances and scoring once.
Everyone at Wolves would like to thank Prince for his efforts while with the club and wish him the very best of luck for the future.