Got some Infinity Cores in Dynamis-Bastok tonight, so I looked up all the info on the Strange Apparatues. I was in Windy at the time, so the closest was Outer Horototo Ruins. Using 3 Purple Chips, 3 Infinity Cores, and the "doctor" password I ended up getting 2 Adaman Nuggets, 8 Cerment Chunks, and the Rune Staff.
Doing some quick tests the Rune Staff seemed to do 6points less damage with my NQ Fire Staff casting Fire III on some Ghouls. However, it did 26points less damage than my HQ Auster's Staff casting Aero III on some Stink Bats.
4MP a tick while engaged was what it seemed to be taking off, due to my Refresh giving -1MP a tick.
Wonder why SE put something like this in the game if the NQ and HQ level 51 Ele staves are so much better. It's level 70 and almost useless... unless of course there is a way to clean the weapon of the -MP effect, like you do when cleaning a weapon for a weaponskill quest.
Hmm... has anyone done any extensive testing with these Rune weapons??!