OD&D and Magic Sword House Rules

How do you run Magic Swords in your campaign? I have run them a lot of different ways over the years. Here is the current method I use in my Redwall inspired campaign:
Magic Swords

Magic Swords, unlike other magic items, are intimately tied to their master on every plane of existence. A magic sword once claimed and used by its master, then becomes the ultimate symbol of its master’s power. An unused, unclaimed magic sword starts out as a semi-sentient entity with the potential for relating to its master as a good dog relates to its dearly loved master. Magic Swords start as a blank slate and align themselves over time with the alignment of their master. A magic sword has its own life-force that it bonds with its master’s life-force when it is treated with the proper respect and care and they become intertwined over time so that they cannot be separated willingly.

A mistreated sword will turn on its master seeking to cause him harm in battle and slowly drinking his life force. A stolen sword is deadly to the thief and will seek to return to its rightful master.

When the master of a sword dies, if he so chooses, his soul will combine with the sword increasing the power of the sword, its Intelligence and its Ego. In this way it is sometimes possible for a great Artifact to be created.

When its master dies there are usually only two things that can normally be done with a magic sword, one is to pass it on to a blood relative who must be like minded with the original master and must seek vengeance for the original master’s death if the killer still lives and if they choose to take up the sword. These inherited swords are the only ones that do not start as a blank slate. If the blood relative is not like minded or does not choose to seek vengeance assuming the killer lives, then they should not take up the sword or it will turn on them.

Inherited swords can be passed down through several generations until a suitable master is found. The other option is to bury the sword with its master where it will guard its master and is deadly to grave robbers.

When the conditions are right for an Artifact to be created, these Magic Swords have a definite purpose and as such it is possible for someone other than a blood relative to wield the sword. This type of sword will seek out the person best suited to fulfill its purpose. Usually this person will have to undergo a series of tests in order to be found worthy.

A newly gained magic sword starts with the ability to glow in the presence of its new master’s enemies and the ability to wound anything that requires magic or silver to wound. As the master grows in power and skill, so grows the sword and they will grow from semi-sentient to fully sentient over time. Swords will as their master grows discover talents unique to that master. No two swords are ever the same. Swords used by those who also wield magic will discover talents unique to that master. Swords forged with unique and special metals will also discover unique talents. The more powerful the master, the more powerful the sword will become.