One of the things I really enjoy about MMOs, and games in general, is neat background details you can sometimes find. Dungeons and Dragons Online has a lot of them, especially in older content. Here is one of my favorites.
If you are working on the Tangleroot Gorge quest line, it has a bit of a Groundhog Day feel to it. You end up going into the same dungeon six or more times, with a slightly different objective on each run. For example your first time in you are just scouting and killing a few hobgoblins, the second time in you are freeing prisoners. However, much of the layout, trap and mob placement is identical on each run.
A lot of players find the quest chain annoyingly repetitive. However, one advantage to the strange setup is that the quests can give you a sense of events progressing over time as you enter and re-enter the dungeon. One of the designers took advantage of this to add in a neat little side story that unfolds over successive runs, but only if you take time to clear out an optional area on every run.
The second time you enter the dungeon, you are rescuing prisoners. However there is an optional area where you can fight some scorpions:
After you kill them, if your strength (or that of one of your hirelings) is high enough you can go through the double doors at the back. There you find this bedraggled NPC:
At first he is raving about invisible bugs that are attack him, but when you start speaking to him he calms down. He relates that he tried to escape, but got stung by the scorpions in the process. He is now dying from the venom, and it's too late for you to help him. As he starts to fade, he relates something ominous:
"Hiding down here in the dark, I started listening . . . listening to the stones. It sounds like I'm mad from the venom. Maybe I am. But I've heard a voice. Something lives down here . . . besides the hobgoblins. Something old and angry. It lives in a watery cave, and it hates. Such hate in that voice . . . I am glad I will never meet its owner."
He then drops to the floor, dead.