This is exactly what I was looking for! My players have recently chanced upon Mordenkainen's Library, where they were offered rewards by its attendants for removing another, far more disruptive intruder. This contains everything I need to accomplish that and more, saving me from having to create these potential artefacts entirely by myself, which gives me more time to prepare every thing else for the next session!
It is exceedingly well written and perfectly captures the voice of Mordenkainen, especially within his supplemental notes that feature as excerpts throughout the book. These inserts are thoroughly entertaining, frequently amusing and add a great deal of enjoyable characterisation to the reading experience. I would say that it is worth reading for these elements alone, as it gives more insight into the life and mind of the archmage, but fortunately, the entire work is equally well realised and provides an invaluable resource for anyone that wants updates and variations of spells and items (and more) from both 5e and classic editions that are Mordenkainen centric (though they can of course be integrated and used without crediting this provenance).
Finally, the layout and design are pleasing, restrained and easy to follow, with a sparing use of art that is used selectively to enhance the experience, rather than splashy page filler.
All in all, highly recommended!