Pretty straight forward. However from personal experience, sheild stacking without an escape tool usually ends in an inevitable death on a magnb if any heat is being applied to you.
If you want to maintain the play style thay your load out suggests ie. Sheild stack + sustain. 5 necro, 5 lich back bar, 1 piece monster set might do better. You are essentially trading the pressure of skoria with the mobility of shadow image. The loss of spell damage from willpower is made up with necro with the added benefit of increases the strength of your chosen form of defense.
Thanks for the suggestions, I've actually been using Necro since it was v14 and I know how awesome it is, this patch I thought I'd change it up as I mostly duel there's no escape anyways so the shade isn't really as necessary.