It is. It is the plural nominative of a noun that is neutrum.
Yes, it's Latin, but not exactly a noun, and not nominative.
There's a special construction in Latin which involves the word res,rei (thing/s). When they wanted to adjectivate that word, they took just the adjective and used it in its neutral form. So instead of saying ad majora res! ("always towards greater things", or "towards greater and greater successes"), where in this case majora is the female form as well (because res is a female word), you can omit the actual noun and use the adjective in its neutral form (which by accident in this example is the same as the female form).
For example, difficilia would be "hard things (to do)" (instead of difficilis res).
BTW, the required case is accusative, since it's a movement towards a place.
Uh... Sorry for derailing the discussion, but yes, Buzz Feiten tuning option, please