Your hero does all the hard work for you: quests, fights in the arena, services (even while you are sleeping or working or in school).
If you care for him (or her) he might get powerful enough to beat all your enemies.
What can I do to make my hero stronger?
Do I have to be online while doing quests or services?
No. All is done automaticly.
You have only to be online when fighting or to get your pay.
When can I be attacked?
Everytime. But don't fear young fellow - if another fighter attacs you, you do not need to regenereate. Your health points stay the same.
You will get more info about fights in the arena