PEACEFUL

After level 3 (last newbie level), you may become a peaceful player here.
Peaceful chars can attack you and you can attack them, but you'll never
get experience from them and they wouldn't go in your throphy list.
Also, they will not get experience, if they attack you and their trophy
list stays the same before they turned to peaceful mode. Only things you
can lose in such fights, is equipment and money, no experience loss.

You can turn to a peacful mode only before 15th level.  You can't turn
a peaceful mode off, it turns off only if you gain a level 5, 10 or 15.
If you are turned to this mode, all character can see that in your
description when they are entering to this room.

Also, if your level is below Master level, you are safe in hometown rooms.
See also: trophy