Got my Uffrat a few weeks ago with DMG+1 INT+5 MND+1 and Avatar: MAB+10 with an NQ stone on my first try. Ive gotten 3 more NQ stones since then and havent been able to match the MAB again, although the DMG was like +6 on other augment attempts, but only +3 or so MAB.
Obtained from participating in Skirmishes. The base avatar magic damage on this staff is on par with Nirvana 80. Almost doubles avatar magic attack compared to Tuahjebat augmented on the Ice path. Still lacks the perpetuation reduction obtainable from Elemental Staves, Fay Crozier, Bahamut's Staff and Magian Staves.
Furthermore, this staff can be augmented to add more Avatar: MAB. Depending on the tier of Ghastly Stone used, it can have an additional +15, putting it on par with the Nirvana 99.