14.1.1 QUEST ITEMS
When you quit or die, you will keep most of your personal items, such as
gold, clothes, vials, backpacks, weapons, armour, and so on. However,
you will drop certain items, such as plants, and all quest-related
items. Furthermore, quest-items (including dead mobile bodies) will
reset out of your inventory every so often, so be sure to be relatively
speedy about completing a quest. The reason this happens is to prevent
someone from collecting quest items and just holding on to them, thus
preventing anyone from doing the quests.
