Hi, and welcome to the community! It's great that you're thinking about potential new talents for CoE, and rest assured that the devs are keeping an eye on the forums for particularly outstanding ideas to add to the game. There are a few problems with this particular idea, however:
The idea of talent-stealing talents has been brought up by the community a number of times, and has been vetoed by the community and the devs as potentially too much like wishing for more wishes.
While tying a talent to a particular item is interesting, talents are abilities that a person has. What you are suggesting is less like a talent and more like a mystical item.
Talents will NOT be inheritable. Talents are attached to bodies, not souls; this has been confirmed by the development team.
All that said, keep thinking about the mechanics of CoE, keep suggesting improvements, keep starting conversations! Even potentially unworkable ideas can lead to new ideas or improvements to existing ones.
Something you might be happy to hear - the existence of vampires in CoE has been confirmed by Caspian. Vampires consume spirit and Souls from players, shortening their lifespan and potentially absorbing their soul wholesale. Doing so to a player with an activated talent absorbs that talent. Vampires no longer have souls, and absorbing a soul from another player both makes THEM a vampire, and makes their soul unplayable until that vampire's death. Check the official Wiki and the forums for more info!