AStoryForOne
create a scenario in which mc uses juggernaut drive and loose control . for protecting everyone he opened a random portel to a new world (tensura ) in his last sanity . mc reach past of tensura (way before cannon) . and start a massacre in his anger or he might fight an another being to death . during the fight he will become a demonlord by absorbing the souls of the dead instinctively . an evolution occurred and mc become a demonlord with draganoid as race like milim . he will stay there for some time because of some problem in space - time or any other bulls and goes back after interaction with other demon lords . by becoming demon lord mc become a semi or complete spritual being . he can give a body to draig by making him his ultimate skill . and release him anytime with having a soul corridor with him . in this way he can have all of draig's power even his flames without having to use boosted gear . it is not bad idea to abandon the sacred gear as there are abilities and even people that nullifies it's abilities . by having it as a ultimate skill it is more safer and convenient as it is his own power. give him a skill similar to Raphael as it will help him in devlopment of other abilities by keeping a clear balance and information , skill synthesis etc. even in other worlds .