The Infinite's Puzzlebox

Once owned by an eccentric necromancer, the Infinite's Puzzlebox is a collection of items that were used to preserve his collection of various creatures.

Rod of Repose

Rod, rare set piece (requires attunement by a cleric) While holding this rod all corpses or other remains within 120 feet of you are protected from decay and can't become undead or be raised from the dead. This also effectively extends the time limit on raising the target from the dead, since time spent under the influence of this rod does't count against the time limit of spells such as raise dead.

If you are killed while attuned to the Glib Skull, the Staff of Reanimation, and the Rod of Repose the three items cast True Resurrection on you and then vanish, scattering across the world in three different places randomly.

Glib Skull

Wand, rare set piece (requires attunement by a cleric)

This skull has 7 charges. While holding it, you can use an action to expend 1 or more of its charges to cast the Speak with Dead spell from it.

The skull regains 1d6 + 1 expended charges daily at dusk. If you expend the skull's last charge, roll a d20. On a 1, the skull laughs as it crumbles into dust to reform somewhere else.

If you are attuned to both the Rod of Repose and the Staff of Reanimation then creatures effected by your Speak with Dead spells can't speak a deliberate lie.

Staff of Reanimation

Staff, rare set piece (requires attunement by a cleric)

This staff has 10 charges. While holding it, you can use an action to expend 1 or more of its charges to cast one of the following spells from it, using your spell save DC and spellcasting ability modifier: cure wounds (1 charge per spell level, up to 3rd), inflict wounds (1 charge per spell level, up to 3rd), or animate dead (3 charges).

The staff regains 1d6 + 4 expended charges daily at dusk. If you expend the last charge, roll a d20. On a 1, the staff becomes inert, unable to regain charges for one year and one day.

If you are attuned to both the Rod of Repose and the Glib Skull you can expend charges to cast the following additional spells from this staff: raise dead (5 charges) and create undead (6 charges).