Quote Originally Posted by Naunet View Post
Undersized only under very specific conditions (you can't do it rallied) and for only select instances.
If those conditions concern no exp and gil. It's to prevent an easy way for Bots to destroy our economy with illegal gold and selling characters. Undersized is meant to have fun. And as a bonus if you happened to have a quest that requires you to do that dungeon again. You can solo it alone.