Another feature of old-school Dungeons and Dragons that has been lost along the way: Intelligent Swords.
The possession of an intelligent sword was a mixed blessing. On the one hand, you had a powerful sword, with extra abilities that benefitted yourself and your party. On the other hand, there was the possibility of a battle of wills between the sword's possessor and the sword itself.
In ODnD, swords with an intelligence of 7 or greater also had an egoism factor. The egoism factor was the will of the sword. Swords with high intelligence and high egoism had a chance of dominating the possessor, thereby subverting the will of the player to pursue his own objectives. For example, a dominating sword might demand that the possessor encrust it with rare gems and beautiful filigree, fight certain monsters, surrender itself to another more worthy fighter, or mount a quest in keeping with the sword's purpose.
Considering the potential battle of wills between the player and the magic sword, some may wonder whether the advantages outweighed the drawbacks. It should be understood that an ODnD magical sword, possessing the same bonus, was more powerful than those of later editions. See my earlier post on magic swords for a further explanation. Because the advantages of magic swords were considerable, and because many players relished the challenge of owning an intelligent and willful sword, I don't recall an instances where intelligent swords were not retained by the player.