Checked on test server and +4 avatar staves will have an additional +3 to DMG and up to -7 Perp. It is not showing the requirements yet due to test server bugs however the upgrades will require 15 of a certain item, i doubt it will be geodes as the previous trial required 40.

Also checked Pet MAB staff trial which adds +1 INT and +1 P.MAB so 11 INT and 13 P.MAB in total.