A Neverwinter Nights Persistent World -- Register using the -forum_pwd command in-game.
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Underdark specifically:
Andunor Slave Pits: next to the grave digger, he's burying slaves, a few more bodies wouldn't hurt.
Saltspar: Off of one of the piers, feed the fish.
Tradepost: Right by the chasm down to the lowerdark, the splatter will mix right in with the rest of the corpses that fail the climb.
One in the Lye would be lovely. If there's not a good "open grave" spot, there can probably be an "object" within the Lye itself (as part of the niche wall pieces).
-One in the underdark boneyards for when you really want to curse someone to be walking that dump forever as a skeleton
A grave dump somewhere in Guldorand would be great, a lot of adventurers die and leave bodies. And sometimes bodies duplicate at server transitions, and there's 2 server transitions in the city.
A Guldorand graveyard would be pretty cool too, actually. Somewhere for players to put gravestones since the city itself is so tight on fixture spaces. The crypts are a bad choice because they're dungeons and not a nice outdoor area, people tend to want their gravestones in outdoor areas. And there's not really a good place for them in the crypts either. The crypts are mostly hallways with few spots that would be a good place to put monuments.