Nifty features that make it easier for me to build, such as being able to search on a room number, are pretty high up on the list for me, but so is being able to do interesting things.
The coolest system I ever built on had the ability to add descriptions that would only be displayed under certain conditions, ranging from time of year, to moon-phase, to whether or not the player had specific spells on her or was carrying a particular item. It meant building was a lot of work, but the end product was well worth it.
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