CREATE NEW STATUS AILMENTS? RM 2K3

Okay here's the deal. I don't want to focus too much on the grinding aspect in my rpg, and remove the need to train. What I'm trying to attempt here is mainly puzzles, and "dungeons" for important items required to battle monsters. Now what I intend on doing is, have specific bosses that dish out terrible status ailments that can be protected against by gaining said items from "dungeons". The problem here is that I don't have any clue on creating status ailments. For example in one instance I want a boss to come out of an acid pool. A basilisk. And it will have a special move that petrifies you. The status will be called petrified, and it works like being frozen, you can't make a move for several turns. This would only be prevented by gaining the mirror specs item. Now I could just make it so that you get frozen. But say there's a boss that actually freezes you, you'd be able to use the mirror specs for that boss and not get frozen an bypass any "dungeon" questing. So would any of you know how to create a status ailment?

Thanks. And I actually did mention my engine. It's in the title...