G potion
G Hi potion
G Returner
G MegaPotion

another random guess...
Moon Curtain
Steel Curtain
Glow Curtain
Accelrator

ok i put some though into these 4...

Solomons Ring (One ruled by an unknown master)
Healing Water (One by the ocean side)
Lightweight (One holds the gates of Hades..I didnt really know but u said relates to Cerberus and this kinda does)
Screw (One hangs on the wall)

im still sticking with the last 4
if the first 8 are close than wow