So rumors Have been confirmed the writer said “after season 5 raps up with Michaels death in a few months season six will start and Lucifer will suffer from depression for unconfirmed reasons and this will literally unleash his horns with and full power. As he harms Chloe, maze and Linda he notices he he must return to hell for good to stop then from further harm and towards the end Chloe kisses the devil face Lucifer expecting him to calm down and stop but it doesn’t he hurts her extremely bad and returns for good and never comes back” all though fans don’t believe this some people speculate that this is a throw off from the real story