Dont be fooled by Illusen's sweet smile. She can be quite demanding. Her quest start off small asking for things that are normally in everyones budget. Soon though she starts to ask for costly items. For thoughs who can afford Illusen's items they will be rewarded.
Leveling
Everyone starts at level one. If you complete level one, you then move on to the next and so on....You are given a time limit to find each item. If you fail, you will start back over at level one. You can attempt a level every 12 hours.
Illusen's Avatar There is currently two known avatars for this game
Finish a Illusen's Glade quest on Illusen Day. March 17th is the only day you can get this avatar.
Finish level 20 of Illusen's Glade quest, and recieve this avatar.
You are given about 17 minutes to complete each level.
Around level 25 she starts asking for unbuyables. (items that can't be found via Shop Wizard.)
You have to wait 12 hours before you can do a Jhudora's Cloud Quest.
Rewards
Unfortunately you are not rewarded on every level. Just a select few levels give you a reward. Seems the higher level you get, the better the reward is.