okay so Boosted Gear didn't go to issei, but instead Saji and issei was born with a twice critical but he died young so he's of no importance anyway so After thousands of years Great Red is bored and he see's Sacred Gear users battle over the centuries and decides to make a sacred gear of his own so he goes to sleep with his consciousness and a fraction of his power in his gear called True Dreams which lets the user Create illusions so powerful they fool all 5 senses and only a super devil or above can tell what's an illusion, but if enough power is used then the user can turn the illusion into reality for a short time, with balance breaker giving the user an area of effect that they can bend and break reality to their wills as long as they have the power they are god in the area
This Gear will go to an oc who will be reincarnated by Rias using 7 normal pawns and 1 mutation pawn he will be a descendant of Diarmuid Ua Duibhne and has both of his ancestor's spears