So in your mind the designer was like, "There's no way to make a dex save, but just for kicks and confusion I'm going not only put one in, but I'm going to include language about what happens when you succeed. Muahahahahahaha!"?
The intent is not clear to me. What I believe the designers wanted to do was have you make a Constitution save every turn to lift the effect. A Dexterity save, to overcome poison makes little sense to start with and even less while you are paralyzed. I think they made a mistake in the wording and in this respect it is poor editing and poor attention to detail.
That is what I believe in terms of the designers mind and intent and how it relates to this. I don't know that for a fact though as I am not them. It is also possible they actually wanted it to be a dexterity save and just did not think it through (again poor attention to detail). Finally it is possible that the intent is for the poison to be unshakable unless you can somehow break the Paralyzed condition, in which case they did a fine job. In terms of likelihood in my mind these are each less likely then the intent was for it to be a Constitution save and
That said, RAW is clear. If you are paralyzed (which will usually be the case) you automatically fail the dex save against the poison.
Language like that is only included if it works.
Unless they did a sloppy job writing, as I believe is the case here.
Because it talks about not only a dex save while paralyzed, but what happens when you succeed, it means you can succeed.
Yes you can succeed as long as tyou are not Paralyed when you make the save.
There is no clarity there. Poison, paralyzation, fireball, it doesn't matter what the save is against. It says you can make a dex save vs. its ability and succeed.
Absolutely, but you can not succeed on the Dex save if you are Paralyzed and nothing in the Carrion Crawler description changes this (for the first minute).
I bolded the portion that would not be there at all if you were correct. It's inclusion means that you get save and can suceed. I underlined the portion allowing success.
Why wouldn't that be there if they want you to make a save at the end of the turn?
Yes you DO get a save and 100% you can succeed at that save as long as you are not Paralyzed, Unconscios, Petrified or Stunned when you make it. If any of those four conditions are in effect you automatically fail the save.