I am playing in a homebrewed setting, not Waterdeep. My DM had my character find the Blackstaff on the body of the leader of a slave owning city where we helped the rebelling slaves. It is modified at least to the point where it does not have the Animate Walking Statues ability, but it isn't clear to me if there are more changes.
It is a super awesome staff, but my character (currently level 17 wizard) and I are both either unaware or unclear about the situation with the Spirit Trap feature:
Spirit Trap. When the Blackstaff dies, the spirit of that individual becomes trapped in the staff along with the spirits of the previous Blackstaffs. (A Blackstaff whose spirit is trapped in the staff can’t be raised from the dead.)
Destroying the staff would release the spirits trapped inside it, but in that event, Khelben’s spirit can lodge itself inside any one piece of the staff that remains. The piece containing Khelben’s spirit has the staff’s Sentience property but none of its other properties. As long as this piece of the staff exists, Khelben’s spirit can make the staff whole again whenever he wishes. When the staff is remade, the spirits of the previous Blackstaffs become trapped inside it again.
Khelben is not a part of our game so I'm not sure if/how this is even a factor. From what I understand, my character can still be revivified because the language does not say "free and willing" for the soul to return to the body, but all other spells seem to have that.
What other things can I do to help my character survive? If she were to do Clone, I think the soul would still go into the staff. If my party were to break the staff, then resurrect her, would that work? Can a character Soulcage themselves? What about a Wish to do Magic Jar if she is super close to death? What other solutions are out there for this? My character has 24 INT but I do not.
Update: Thanks for all the replies and advice. I sent this to my DM: Hey, i posted this question on stack exchange and based on the replies, i think i need to ask you this: can you please make a homebrew item of the Blackstaff that has whatever Minerva understands it to have based on studying it and casting identify? I know it may still have secret stuff and I am just a bit confused about what she knows, so its been hard to determine what would be fair for her to do with the information she has. Everyone was like, talk to your dm, silly goose. XD
He replied: kinda fun a whole forum started with folks trying at it. You know enough that it is a sentient in its nature, but in terms of the original lore of blackstaff, none of it applies in terms of the personalities and individuals interacted with in original lore.