the changes of delirium need to be more impactful, i mean the new delirium make us spam bloodspiller like certain madmans so to get rid of delirium we need to redirect all that potency somewhere with a new combo or somekind of new interaction with our skills, probably make delirium apart of let us generate more blood and MP grants dark arts on soul eater or the new combo during the duration of the buff, that will be more interesting.

the living shadow mmm nop, that will make fray only use bloodspiller only, it's a glorified dot but idk how complex is make the shadow copy all hour skills and most important how will affect the players with high ping.

over ayssal drain, i will love if the skill is affected by dark arts and become free of CD under DA, i consider it will be ok, the potency sould meaby match flood of darkness so if you want to extend darkside use this one with dark arts, if not then abyssal drain and with the natural CD stay used on single target encounters.