Thinking about it, I honestly believe it's time to see a Curse Strata along with a lot more monsters capable of inflicting it.

Curse is actually a really cool status but it's also one of the most powerful in the game. There's a hand-full of armor that provides Curse Resistance and even some armor that provides Curse Weakness. Aside from the use of Faust and Gran Faust, these armors practically have absolutely no use aside from a couple of exceptions and cases.

I understand there are monsters about that do inflict curse but the problem is aside from a few, all of them are event only:

• Phantoms which only appear in Graveyards.
• Carnavons which only appear in Shadow Lair: Firestorm Citadel and a Scenario Room
• Black Kats which are event only
• Margrel which although isn't entirely event only, the item required to summon is.
• Almirian Shadow Guards which appear only once in the Danger Mission Legion of Almire and during specific periods in Shadow Lair: Firestorm Citadel
• Darkfire Vanaduke which only appears in Shadow Lair: Firestorm Citadel
• Dread Velvet which is event only

As you can see, the only real handful of places the armor is useful in is the Graveyard which only applies to the Charge Attacks of Phantoms and can easily be dodged and Shadow Lair: Firestorm Citadel both of which are pretty easy to control and there are better armor choices in general.

For the fear of it being too overwhelming for newer knights, I may suggest only have it in Stratum 6 of the Arcade at random intervals during Gate Construction.

There's a lot more that could probably be added to this but I feel as though this is a decent amount to give a generalized idea of what to be added.

Besides, imagine Curse-inflicting Devlite Arenas.