so I know this is a stupid question but im fresh to speedrunning and just found out about the troll ending on floor 13, could that be used as the end for any%?

No, but we might add a troll% category

I'd definitely run troll ending from time to time; not having to do floor 15 especially is great. If it were to be implemented, it'd be nice to have it as a dropdown toggle for which ending is achieved so you can run it in any main category.

If you add that category, I request not making the name troll% as some people hate % names (including me) when it's not an actual number (low% is an exception as it is a substitute for a number).