Memory, made from Lum + Po/Io + Sol + Eth, in that order. This works in all four-socket staves. Possible in v1.08 and above.
Quite nice stats, as they have to be to justify giving up a shield to use it. Static Field and Energy Shield both get +2 from this Runeword, so there must have been +1 to Energy Shield on this staff to begin with.
Note that the Io/Po rune #16, is used in this one, and even though it's now called "Po" in the game, this says "Io" in the RuneWord name. Something Bliz has to change individually, it seems.
Weapons Runewords