Necronomicon: Increases the power of your magic as if you were
in s supermagic area.
Mist of R'lyeh: You are protected agains all kinds of offensive
magic.
Ring of Eibon: Neutralizes all resistances/immunities of your
opponent.
Blessing of Nephran: Makes you immune to all age effects inclusive
death of old age.
Power of Abhoth: Gives you access to the dead God's mana pool.