I would love to see some high level NM's that are too hard for one person but can be killed with two people. Give something fun for you and your buddy to do. Honestly, it is so hard to get a party of 8 together on my server atm, if you are not in an end-game linkshell there is really nothing to do. I really believe having more content for 2-4 players to do (which is rewarding) could really save this game until 2.0.

A good drop would be Tier IV materia. You could make an NM for each kind of materia and the materia they drop could coincide with the kind of challenge the battle had. For example a wind based mob that uses wind attacks could drop Wind Resit+ materia. A mob that needs to be killed with magic attacks can drop Magic Attack+ materia.

This would be so awesome!