As GM, I am having a now-deceased 30th-level wizard's spell last after his death . dr mama phina Call +27738618717 In south Africa

As GM, I am having a now-deceased 30th-level wizard's spell last after his death . dr mama phina It is a spell to conceal an object in a Dimensional Pocket keyed to one of the right bloodline who knows the password. I do not know a spell that can do this, so I'm looking for ammunition to use against the rules lawyers in my group who will say that a spell effect ends with a wizard's death.
The circumstances are that a specific family of wizards who guarded an ancient key to the revival of a certain being concealed it in a powerful dimensional lock, and whenever they were about to die they taught their successor both the Sealing Spell and the keyword to open it, and entrusted them with the artefact. As a last act they perform the Sealing Spell on an object their heir possesses, because being more skilful wizards their magic is stronger at that age. The heir to the 30th level wizard is going to meet with the party and initially fight them and, should they be smart and not kill her, they will hear her story and the evil which she guards; whereas should they kill her, they won't know until later that the evil is even afoot. I Call +27738618717 In south Africa