The new quest system:

Quests have to be approved and introduced into the quest system by a
game master. You should discuss your quest projects with wizards and
archwizards, and when the time of approval is approaching, do these
preparation steps:

Make a text file to contain the hint for your quest, it may file one
page, that is approx. 20 lines, but 3 lines is fine just as well.
It will be placed in /lib/quests.

Put this_player()->set_quest("name") at the point where the quest is
solved, the string <name> is a short id without spaces, can contain
underscores (e.g. in "orc_slayer").