Help with evo world?

Since this topic is about Evo World I'll just ask a question pertaining to it too: If I got something like Herb drop rate + 100% and added a 30% drop rate core, would they stack or would only the herb one take effect for herb drops?

You can't use the same type of cores, so I believe they would stack. I've also used that combination before and it seemed to drop more herbs than usual. It's a good way to farm juniper berry oils.

I'll join in the thread since I feel silly in creating a thread to ask a simple question.

Does Wheel of Fortune (revives you in the same map) work in Evolving World? Or must I survive the entirely of Shadow Cygnus?

Wheels don't work. Resurrection does however.

EDIT: I don't remember reading this before, but was Shadow Empress affected by Unlimited Boss Changes? Is her HP 2.1b, or raised beyond that?

http://www.southperry.net/showthread.php?t=65866

31.5b HP, 100% DEF/MDEF.

Also, I believe you'll only have 20 minutes in Evo World after Unlimited?