Quote Originally Posted by SpankWustler View Post

If nobody has mentioned it yet, the augmented Dark Rings from Abyssea-Konschat are a very large and entirely free source of -DT%. You'll be gaining merits and key items while you try for the rings, and you can sell all the sub-par rings for a very decent amount of gil.

They're good for any idle or OH NO! set from the moment they're obtained until eternity, on any job.
I did forget about those rings. I won't say it's a must have but you can some good mileage out of having 2 of those rings on. +2 to all stats is nice (on the low side) and if you get lucky/keep farming and get the rings with -6 pdt/mdt on them that will help damage mitigation greatly. Also the 32k a pop they sell for is incentive enough to try for at least one.