In most D&D games, it is a team adventure, but every now and then a player wants… no demands a solo adventure for their PC.
On a more direct involvement, we had an assassin (1e) who would bug the DM endlessly for over a month to get an assignment from his guild.
The DM finally gave in, and a contract to kill a local tax collector was offered. This old human male lived in a mansion at the edge of the city. What the assassin did not know until it was too late that the tax collector was Geryon in disguise.
Surprise back stab attempt and many magical weapons (critical miss, damaged/destroyed weapons) later, and down to 2 or 3 hit point, the assassin grabbed its last weapon, a vorpol blade and score a natural 20 to hit!
After that, the player was OK for a week before wanting another contract. He enjoyed it too much. Sure it cost him all but his last magical item.
So the DM, in the next session and before they group had a chance to get any replacement weapons, the group was in the wilderness and we had to camp for the night. A thick mist entered, obscuring all. We all awoke to the smell of smoke and brimstone. The party left their tents to discover they were now on a tall and wide stone wall, and the assassin’s tent was not here.
As the smoke lifted we discovered we were actually in what would be called the royal box of an arena and the assassin (and his tent) was twenty yards away in the middle of the arena.
The assassin (and the group) were confused as to what was going on.
As more of the smoke lifted, we saw demons and devils filled all the sits in the arena.
A huge horn sounded and thru the only gate into the arena a fully pissed off Geryon entered.
“So little man, you were able to kill my avatar in the prime plane with that weapon of yours. How lucky do you feel for a rematch… on my HOME PLANE of hell!”
While the players all laughted out loud, the player/assassin groaned. “Oh sh!t”.
After that session, no player decided to bug any DM about such quest(s) that is only for their PC to do.
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