Is more then that, there a very HARD NM in the game, is pretty invisible to everyone but it exist!! Wiki also have no info about this one, many LS fought it and they just keep they strategy for they self, it call 'REAL PLAYER' NM, you have no idea how hard these NM are until you start leading something, of course you can use cheat again 'REAL PLAYER' NM and SE wont ban you if you do it, but there other way to fight these special NM. Careful cheat feed a lot of TP to that NM and might spam some nasty WS.
You need careful, the worse WS is call "Drama-Lamia" is AoE and can wipe your linkshell, but ya without enter in all detail about it, they exist!! [Because of course i am like other linkshell and i don't wan give you all the trick]
Edit: If you think cheating everyone to get you relic is the way to go, well i am sorry but you need work a bit more around your strategy again this NM :P
Edit2: There also a LEADER NM in the game, but everyone know how easy is to kill it [PEARL-DROP WS.] And you don't need a lots of TP to perform this action.
All depend how you look at it tbh.