Whenever damage would be dealt to you, Pariah's Shield causes that damage to be redirected to the creature it is attached to.
Since Caduceus grants an ability to the creature preventing damage being dealt to it, no damage is dealt to you or to that creature.

Prevent all damage that would be dealt to you

Caduceus, Staff of Hermes

Pariah's Shield

Whenever damage would be dealt to you, Pariah causes that damage to be redirected to the creature it is attached to.
Since Caduceus grants an ability to the creature preventing damage being dealt to it, no damage is dealt to you or to that creature.

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