These are the ideas I had a while ago, Hopefully you guys read this :o, I currently only have these ideas. I will update them when I get other good ideas!
Evil/Predator Dayan It would be cool if there was a type of dayan that isn't catchable, something like evil dayan, they could also be predators to certain dayan. Certain dayan that have a higher predator chance for a specific predator/evil dayan can attract that predator dayan more often than others. Some predator/evil dayan can only be found in specific places too!
Dark Lands Dark Lands can have higher chances of having predator/evil dayan lurking around it, It can also have a slightly higher chance of encountering rare variation dayan!