Silence= Most NMs are immune
Sleep=Most NMs are immune
Gravity=Most NMs are immune
Break=Most NMs are immune
Bind=Most NMs are immune

That leaves us with Slow/Paralyze/Addle/Dia/Blind. That would be like making most NM's immune to 2/3rds of all elemental magic. Paralyze is hard to land and even if it does land, the proc rate sucks on NMs. Slow is worthless since a mob's regular attacks are easily mitigated, its the TP moves that destroy players, not the autoattacks; slow has very little value. Addle is kind of cool, makes spells a bit easier to stun since the window of casting time is a bit longer.

RDM should get an Inhibit TP spell that stacks with Penance, a spell that gives a TP-Penalty(opposite of TP Bonus), it would reduce the power of TP moves, or a spell that increase the amount of TP a mob needs to use a TP move from 100% to 200% (but the TP move's power is still counted as if it was a 100% TP move) thus it would take a bit longer for a mob to use a TP move. A magic defense down or Plague spell would be neat too.

In order to make Addle somewhat more potent and useful, could it also double or even triple the MP cost of spells for the target?